public class StringUtils
extends java.lang.Object
Operations on String
that are
null
safe.
The StringUtils
class defines certain words related to
String handling.
null
""
)' '
, char 32)Character.isWhitespace(char)
String.trim()
StringUtils
handles null
input Strings quietly.
That is to say that a null
input will return null
.
Where a boolean
or int
is being returned
details vary by method.
A side effect of the null
handling is that a
NullPointerException
should be considered a bug in
StringUtils
.
Methods in this class give sample code to explain their operation.
The symbol *
is used to indicate any input including null
.
#ThreadSafe#
String
Modifier and Type | Field and Description |
---|---|
static java.lang.String |
CR
A String for carriage return CR ("\r").
|
static java.lang.String |
EMPTY
The empty String
"" . |
static int |
INDEX_NOT_FOUND
Represents a failed index search.
|
static java.lang.String |
LF
A String for linefeed LF ("\n").
|
static java.lang.String |
SPACE
A String for a space character.
|
Constructor and Description |
---|
StringUtils()
StringUtils instances should NOT be constructed in
standard programming. |
Modifier and Type | Method and Description |
---|---|
static java.lang.String |
abbreviate(java.lang.String str,
int maxWidth)
Abbreviates a String using ellipses.
|
static java.lang.String |
abbreviate(java.lang.String str,
int offset,
int maxWidth)
Abbreviates a String using ellipses.
|
static java.lang.String |
abbreviate(java.lang.String str,
java.lang.String abbrevMarker,
int maxWidth)
Abbreviates a String using another given String as replacement marker.
|
static java.lang.String |
abbreviate(java.lang.String str,
java.lang.String abbrevMarker,
int offset,
int maxWidth)
Abbreviates a String using a given replacement marker.
|
static java.lang.String |
abbreviateMiddle(java.lang.String str,
java.lang.String middle,
int length)
Abbreviates a String to the length passed, replacing the middle characters with the supplied
replacement String.
|
static java.lang.String |
appendIfMissing(java.lang.String str,
java.lang.CharSequence suffix,
java.lang.CharSequence... suffixes)
Appends the suffix to the end of the string if the string does not
already end with any of the suffixes.
|
static java.lang.String |
appendIfMissingIgnoreCase(java.lang.String str,
java.lang.CharSequence suffix,
java.lang.CharSequence... suffixes)
Appends the suffix to the end of the string if the string does not
already end, case insensitive, with any of the suffixes.
|
static java.lang.String |
capitalize(java.lang.String str)
Capitalizes a String changing the first character to title case as
per
Character.toTitleCase(int) . |
static java.lang.String |
center(java.lang.String str,
int size)
Centers a String in a larger String of size
size
using the space character (' '). |
static java.lang.String |
center(java.lang.String str,
int size,
char padChar)
Centers a String in a larger String of size
size . |
static java.lang.String |
center(java.lang.String str,
int size,
java.lang.String padStr)
Centers a String in a larger String of size
size . |
static java.lang.String |
chomp(java.lang.String str)
Removes one newline from end of a String if it's there,
otherwise leave it alone.
|
static java.lang.String |
chomp(java.lang.String str,
java.lang.String separator)
Deprecated.
This feature will be removed in Lang 4.0, use
removeEnd(String, String) instead |
static java.lang.String |
chop(java.lang.String str)
Remove the last character from a String.
|
static int |
compare(java.lang.String str1,
java.lang.String str2)
Compare two Strings lexicographically, as per
String.compareTo(String) , returning : |
static int |
compare(java.lang.String str1,
java.lang.String str2,
boolean nullIsLess)
Compare two Strings lexicographically, as per
String.compareTo(String) , returning : |
static int |
compareIgnoreCase(java.lang.String str1,
java.lang.String str2)
Compare two Strings lexicographically, ignoring case differences,
as per
String.compareToIgnoreCase(String) , returning : |
static int |
compareIgnoreCase(java.lang.String str1,
java.lang.String str2,
boolean nullIsLess)
Compare two Strings lexicographically, ignoring case differences,
as per
String.compareToIgnoreCase(String) , returning : |
static boolean |
contains(java.lang.CharSequence seq,
java.lang.CharSequence searchSeq)
Checks if CharSequence contains a search CharSequence, handling
null . |
static boolean |
contains(java.lang.CharSequence seq,
int searchChar)
Checks if CharSequence contains a search character, handling
null . |
static boolean |
containsAny(java.lang.CharSequence cs,
char... searchChars)
Checks if the CharSequence contains any character in the given
set of characters.
|
static boolean |
containsAny(java.lang.CharSequence cs,
java.lang.CharSequence... searchCharSequences)
Checks if the CharSequence contains any of the CharSequences in the given array.
|
static boolean |
containsAny(java.lang.CharSequence cs,
java.lang.CharSequence searchChars)
Checks if the CharSequence contains any character in the given set of characters.
|
static boolean |
containsIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence searchStr)
Checks if CharSequence contains a search CharSequence irrespective of case,
handling
null . |
static boolean |
containsNone(java.lang.CharSequence cs,
char... searchChars)
Checks that the CharSequence does not contain certain characters.
|
static boolean |
containsNone(java.lang.CharSequence cs,
java.lang.String invalidChars)
Checks that the CharSequence does not contain certain characters.
|
static boolean |
containsOnly(java.lang.CharSequence cs,
char... valid)
Checks if the CharSequence contains only certain characters.
|
static boolean |
containsOnly(java.lang.CharSequence cs,
java.lang.String validChars)
Checks if the CharSequence contains only certain characters.
|
static boolean |
containsWhitespace(java.lang.CharSequence seq)
Check whether the given CharSequence contains any whitespace characters.
|
static int |
countMatches(java.lang.CharSequence str,
char ch)
Counts how many times the char appears in the given string.
|
static int |
countMatches(java.lang.CharSequence str,
java.lang.CharSequence sub)
Counts how many times the substring appears in the larger string.
|
static <T extends java.lang.CharSequence> |
defaultIfBlank(T str,
T defaultStr)
Returns either the passed in CharSequence, or if the CharSequence is
whitespace, empty ("") or
null , the value of defaultStr . |
static <T extends java.lang.CharSequence> |
defaultIfEmpty(T str,
T defaultStr)
Returns either the passed in CharSequence, or if the CharSequence is
empty or
null , the value of defaultStr . |
static java.lang.String |
defaultString(java.lang.String str)
Returns either the passed in String,
or if the String is
null , an empty String (""). |
static java.lang.String |
defaultString(java.lang.String str,
java.lang.String defaultStr)
Returns either the passed in String, or if the String is
null , the value of defaultStr . |
static java.lang.String |
deleteWhitespace(java.lang.String str)
Deletes all whitespaces from a String as defined by
Character.isWhitespace(char) . |
static java.lang.String |
difference(java.lang.String str1,
java.lang.String str2)
Compares two Strings, and returns the portion where they differ.
|
static boolean |
endsWith(java.lang.CharSequence str,
java.lang.CharSequence suffix)
Check if a CharSequence ends with a specified suffix.
|
static boolean |
endsWithAny(java.lang.CharSequence sequence,
java.lang.CharSequence... searchStrings)
Check if a CharSequence ends with any of the provided case-sensitive suffixes.
|
static boolean |
endsWithIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence suffix)
Case insensitive check if a CharSequence ends with a specified suffix.
|
static boolean |
equals(java.lang.CharSequence cs1,
java.lang.CharSequence cs2)
Compares two CharSequences, returning
true if they represent
equal sequences of characters. |
static boolean |
equalsAny(java.lang.CharSequence string,
java.lang.CharSequence... searchStrings)
Compares given
string to a CharSequences vararg of searchStrings ,
returning true if the string is equal to any of the searchStrings . |
static boolean |
equalsAnyIgnoreCase(java.lang.CharSequence string,
java.lang.CharSequence... searchStrings)
Compares given
string to a CharSequences vararg of searchStrings ,
returning true if the string is equal to any of the searchStrings , ignoring case. |
static boolean |
equalsIgnoreCase(java.lang.CharSequence cs1,
java.lang.CharSequence cs2)
Compares two CharSequences, returning
true if they represent
equal sequences of characters, ignoring case. |
static <T extends java.lang.CharSequence> |
firstNonBlank(T... values)
Returns the first value in the array which is not empty (""),
null or whitespace only. |
static <T extends java.lang.CharSequence> |
firstNonEmpty(T... values)
Returns the first value in the array which is not empty.
|
static java.lang.String |
getCommonPrefix(java.lang.String... strs)
Compares all Strings in an array and returns the initial sequence of
characters that is common to all of them.
|
static java.lang.String |
getDigits(java.lang.String str)
Checks if a String
str contains Unicode digits,
if yes then concatenate all the digits in str and return it as a String. |
static int |
getFuzzyDistance(java.lang.CharSequence term,
java.lang.CharSequence query,
java.util.Locale locale)
Deprecated.
as of 3.6, use commons-text
FuzzyScore instead
|
static double |
getJaroWinklerDistance(java.lang.CharSequence first,
java.lang.CharSequence second)
Deprecated.
as of 3.6, use commons-text
JaroWinklerDistance instead
|
static int |
getLevenshteinDistance(java.lang.CharSequence s,
java.lang.CharSequence t)
Deprecated.
as of 3.6, use commons-text
LevenshteinDistance instead
|
static int |
getLevenshteinDistance(java.lang.CharSequence s,
java.lang.CharSequence t,
int threshold)
Deprecated.
as of 3.6, use commons-text
LevenshteinDistance instead
|
static int |
indexOf(java.lang.CharSequence seq,
java.lang.CharSequence searchSeq)
Finds the first index within a CharSequence, handling
null . |
static int |
indexOf(java.lang.CharSequence seq,
java.lang.CharSequence searchSeq,
int startPos)
Finds the first index within a CharSequence, handling
null . |
static int |
indexOf(java.lang.CharSequence seq,
int searchChar)
Returns the index within
seq of the first occurrence of
the specified character. |
static int |
indexOf(java.lang.CharSequence seq,
int searchChar,
int startPos)
Returns the index within
seq of the first occurrence of the
specified character, starting the search at the specified index. |
static int |
indexOfAny(java.lang.CharSequence cs,
char... searchChars)
Search a CharSequence to find the first index of any
character in the given set of characters.
|
static int |
indexOfAny(java.lang.CharSequence str,
java.lang.CharSequence... searchStrs)
Find the first index of any of a set of potential substrings.
|
static int |
indexOfAny(java.lang.CharSequence cs,
java.lang.String searchChars)
Search a CharSequence to find the first index of any
character in the given set of characters.
|
static int |
indexOfAnyBut(java.lang.CharSequence cs,
char... searchChars)
Searches a CharSequence to find the first index of any
character not in the given set of characters.
|
static int |
indexOfAnyBut(java.lang.CharSequence seq,
java.lang.CharSequence searchChars)
Search a CharSequence to find the first index of any
character not in the given set of characters.
|
static int |
indexOfDifference(java.lang.CharSequence... css)
Compares all CharSequences in an array and returns the index at which the
CharSequences begin to differ.
|
static int |
indexOfDifference(java.lang.CharSequence cs1,
java.lang.CharSequence cs2)
Compares two CharSequences, and returns the index at which the
CharSequences begin to differ.
|
static int |
indexOfIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence searchStr)
Case in-sensitive find of the first index within a CharSequence.
|
static int |
indexOfIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence searchStr,
int startPos)
Case in-sensitive find of the first index within a CharSequence
from the specified position.
|
static boolean |
isAllBlank(java.lang.CharSequence... css)
Checks if all of the CharSequences are empty (""), null or whitespace only.
|
static boolean |
isAllEmpty(java.lang.CharSequence... css)
Checks if all of the CharSequences are empty ("") or null.
|
static boolean |
isAllLowerCase(java.lang.CharSequence cs)
Checks if the CharSequence contains only lowercase characters.
|
static boolean |
isAllUpperCase(java.lang.CharSequence cs)
Checks if the CharSequence contains only uppercase characters.
|
static boolean |
isAlpha(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters.
|
static boolean |
isAlphanumeric(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters or digits.
|
static boolean |
isAlphanumericSpace(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters, digits
or space (
' ' ). |
static boolean |
isAlphaSpace(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters and
space (' ').
|
static boolean |
isAnyBlank(java.lang.CharSequence... css)
Checks if any of the CharSequences are empty ("") or null or whitespace only.
|
static boolean |
isAnyEmpty(java.lang.CharSequence... css)
Checks if any of the CharSequences are empty ("") or null.
|
static boolean |
isAsciiPrintable(java.lang.CharSequence cs)
Checks if the CharSequence contains only ASCII printable characters.
|
static boolean |
isBlank(java.lang.CharSequence cs)
Checks if a CharSequence is empty (""), null or whitespace only.
|
static boolean |
isEmpty(java.lang.CharSequence cs)
Checks if a CharSequence is empty ("") or null.
|
static boolean |
isMixedCase(java.lang.CharSequence cs)
Checks if the CharSequence contains mixed casing of both uppercase and lowercase characters.
|
static boolean |
isNoneBlank(java.lang.CharSequence... css)
Checks if none of the CharSequences are empty (""), null or whitespace only.
|
static boolean |
isNoneEmpty(java.lang.CharSequence... css)
Checks if none of the CharSequences are empty ("") or null.
|
static boolean |
isNotBlank(java.lang.CharSequence cs)
Checks if a CharSequence is not empty (""), not null and not whitespace only.
|
static boolean |
isNotEmpty(java.lang.CharSequence cs)
Checks if a CharSequence is not empty ("") and not null.
|
static boolean |
isNumeric(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode digits.
|
static boolean |
isNumericSpace(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode digits or space
(
' ' ). |
static boolean |
isWhitespace(java.lang.CharSequence cs)
Checks if the CharSequence contains only whitespace.
|
static java.lang.String |
join(byte[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(byte[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(char[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(char[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(double[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(double[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(float[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(float[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(int[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(int[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(java.lang.Iterable<?> iterable,
char separator)
Joins the elements of the provided
Iterable into
a single String containing the provided elements. |
static java.lang.String |
join(java.lang.Iterable<?> iterable,
java.lang.String separator)
Joins the elements of the provided
Iterable into
a single String containing the provided elements. |
static java.lang.String |
join(java.util.Iterator<?> iterator,
char separator)
Joins the elements of the provided
Iterator into
a single String containing the provided elements. |
static java.lang.String |
join(java.util.Iterator<?> iterator,
java.lang.String separator)
Joins the elements of the provided
Iterator into
a single String containing the provided elements. |
static java.lang.String |
join(java.util.List<?> list,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided
List into a single String
containing the provided list of elements. |
static java.lang.String |
join(java.util.List<?> list,
java.lang.String separator,
int startIndex,
int endIndex)
Joins the elements of the provided
List into a single String
containing the provided list of elements. |
static java.lang.String |
join(long[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(long[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(java.lang.Object[] array,
char separator)
Joins the elements of the provided array into a single String
containing the provided list of elements.
|
static java.lang.String |
join(java.lang.Object[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String
containing the provided list of elements.
|
static java.lang.String |
join(java.lang.Object[] array,
java.lang.String separator)
Joins the elements of the provided array into a single String
containing the provided list of elements.
|
static java.lang.String |
join(java.lang.Object[] array,
java.lang.String separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String
containing the provided list of elements.
|
static java.lang.String |
join(short[] array,
char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static java.lang.String |
join(short[] array,
char separator,
int startIndex,
int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
|
static <T> java.lang.String |
join(T... elements)
Joins the elements of the provided array into a single String
containing the provided list of elements.
|
static java.lang.String |
joinWith(java.lang.String separator,
java.lang.Object... objects)
Joins the elements of the provided varargs into a
single String containing the provided elements.
|
static int |
lastIndexOf(java.lang.CharSequence seq,
java.lang.CharSequence searchSeq)
Finds the last index within a CharSequence, handling
null . |
static int |
lastIndexOf(java.lang.CharSequence seq,
java.lang.CharSequence searchSeq,
int startPos)
Finds the last index within a CharSequence, handling
null . |
static int |
lastIndexOf(java.lang.CharSequence seq,
int searchChar)
Returns the index within
seq of the last occurrence of
the specified character. |
static int |
lastIndexOf(java.lang.CharSequence seq,
int searchChar,
int startPos)
Returns the index within
seq of the last occurrence of
the specified character, searching backward starting at the
specified index. |
static int |
lastIndexOfAny(java.lang.CharSequence str,
java.lang.CharSequence... searchStrs)
Find the latest index of any of a set of potential substrings.
|
static int |
lastIndexOfIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence searchStr)
Case in-sensitive find of the last index within a CharSequence.
|
static int |
lastIndexOfIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence searchStr,
int startPos)
Case in-sensitive find of the last index within a CharSequence
from the specified position.
|
static int |
lastOrdinalIndexOf(java.lang.CharSequence str,
java.lang.CharSequence searchStr,
int ordinal)
Finds the n-th last index within a String, handling
null . |
static java.lang.String |
left(java.lang.String str,
int len)
Gets the leftmost
len characters of a String. |
static java.lang.String |
leftPad(java.lang.String str,
int size)
Left pad a String with spaces (' ').
|
static java.lang.String |
leftPad(java.lang.String str,
int size,
char padChar)
Left pad a String with a specified character.
|
static java.lang.String |
leftPad(java.lang.String str,
int size,
java.lang.String padStr)
Left pad a String with a specified String.
|
static int |
length(java.lang.CharSequence cs)
Gets a CharSequence length or
0 if the CharSequence is
null . |
static java.lang.String |
lowerCase(java.lang.String str)
Converts a String to lower case as per
String.toLowerCase() . |
static java.lang.String |
lowerCase(java.lang.String str,
java.util.Locale locale)
Converts a String to lower case as per
String.toLowerCase(Locale) . |
static java.lang.String |
mid(java.lang.String str,
int pos,
int len)
Gets
len characters from the middle of a String. |
static java.lang.String |
normalizeSpace(java.lang.String str)
|
static int |
ordinalIndexOf(java.lang.CharSequence str,
java.lang.CharSequence searchStr,
int ordinal)
Finds the n-th index within a CharSequence, handling
null . |
static java.lang.String |
overlay(java.lang.String str,
java.lang.String overlay,
int start,
int end)
Overlays part of a String with another String.
|
static java.lang.String |
prependIfMissing(java.lang.String str,
java.lang.CharSequence prefix,
java.lang.CharSequence... prefixes)
Prepends the prefix to the start of the string if the string does not
already start with any of the prefixes.
|
static java.lang.String |
prependIfMissingIgnoreCase(java.lang.String str,
java.lang.CharSequence prefix,
java.lang.CharSequence... prefixes)
Prepends the prefix to the start of the string if the string does not
already start, case insensitive, with any of the prefixes.
|
static java.lang.String |
remove(java.lang.String str,
char remove)
Removes all occurrences of a character from within the source string.
|
static java.lang.String |
remove(java.lang.String str,
java.lang.String remove)
Removes all occurrences of a substring from within the source string.
|
static java.lang.String |
removeAll(java.lang.String text,
java.lang.String regex)
Deprecated.
Moved to RegExUtils.
|
static java.lang.String |
removeEnd(java.lang.String str,
java.lang.String remove)
Removes a substring only if it is at the end of a source string,
otherwise returns the source string.
|
static java.lang.String |
removeEndIgnoreCase(java.lang.String str,
java.lang.String remove)
Case insensitive removal of a substring if it is at the end of a source string,
otherwise returns the source string.
|
static java.lang.String |
removeFirst(java.lang.String text,
java.lang.String regex)
Deprecated.
Moved to RegExUtils.
|
static java.lang.String |
removeIgnoreCase(java.lang.String str,
java.lang.String remove)
Case insensitive removal of all occurrences of a substring from within
the source string.
|
static java.lang.String |
removePattern(java.lang.String source,
java.lang.String regex)
Deprecated.
Moved to RegExUtils.
|
static java.lang.String |
removeStart(java.lang.String str,
java.lang.String remove)
Removes a substring only if it is at the beginning of a source string,
otherwise returns the source string.
|
static java.lang.String |
removeStartIgnoreCase(java.lang.String str,
java.lang.String remove)
Case insensitive removal of a substring if it is at the beginning of a source string,
otherwise returns the source string.
|
static java.lang.String |
repeat(char ch,
int repeat)
Returns padding using the specified delimiter repeated
to a given length.
|
static java.lang.String |
repeat(java.lang.String str,
int repeat)
Repeat a String
repeat times to form a
new String. |
static java.lang.String |
repeat(java.lang.String str,
java.lang.String separator,
int repeat)
Repeat a String
repeat times to form a
new String, with a String separator injected each time. |
static java.lang.String |
replace(java.lang.String text,
java.lang.String searchString,
java.lang.String replacement)
Replaces all occurrences of a String within another String.
|
static java.lang.String |
replace(java.lang.String text,
java.lang.String searchString,
java.lang.String replacement,
int max)
Replaces a String with another String inside a larger String,
for the first
max values of the search String. |
static java.lang.String |
replaceAll(java.lang.String text,
java.lang.String regex,
java.lang.String replacement)
Deprecated.
Moved to RegExUtils.
|
static java.lang.String |
replaceChars(java.lang.String str,
char searchChar,
char replaceChar)
Replaces all occurrences of a character in a String with another.
|
static java.lang.String |
replaceChars(java.lang.String str,
java.lang.String searchChars,
java.lang.String replaceChars)
Replaces multiple characters in a String in one go.
|
static java.lang.String |
replaceEach(java.lang.String text,
java.lang.String[] searchList,
java.lang.String[] replacementList)
Replaces all occurrences of Strings within another String.
|
static java.lang.String |
replaceEachRepeatedly(java.lang.String text,
java.lang.String[] searchList,
java.lang.String[] replacementList)
Replaces all occurrences of Strings within another String.
|
static java.lang.String |
replaceFirst(java.lang.String text,
java.lang.String regex,
java.lang.String replacement)
Deprecated.
Moved to RegExUtils.
|
static java.lang.String |
replaceIgnoreCase(java.lang.String text,
java.lang.String searchString,
java.lang.String replacement)
Case insensitively replaces all occurrences of a String within another String.
|
static java.lang.String |
replaceIgnoreCase(java.lang.String text,
java.lang.String searchString,
java.lang.String replacement,
int max)
Case insensitively replaces a String with another String inside a larger String,
for the first
max values of the search String. |
static java.lang.String |
replaceOnce(java.lang.String text,
java.lang.String searchString,
java.lang.String replacement)
Replaces a String with another String inside a larger String, once.
|
static java.lang.String |
replaceOnceIgnoreCase(java.lang.String text,
java.lang.String searchString,
java.lang.String replacement)
Case insensitively replaces a String with another String inside a larger String, once.
|
static java.lang.String |
replacePattern(java.lang.String source,
java.lang.String regex,
java.lang.String replacement)
Deprecated.
Moved to RegExUtils.
|
static java.lang.String |
reverse(java.lang.String str)
Reverses a String as per
StringBuilder.reverse() . |
static java.lang.String |
reverseDelimited(java.lang.String str,
char separatorChar)
Reverses a String that is delimited by a specific character.
|
static java.lang.String |
right(java.lang.String str,
int len)
Gets the rightmost
len characters of a String. |
static java.lang.String |
rightPad(java.lang.String str,
int size)
Right pad a String with spaces (' ').
|
static java.lang.String |
rightPad(java.lang.String str,
int size,
char padChar)
Right pad a String with a specified character.
|
static java.lang.String |
rightPad(java.lang.String str,
int size,
java.lang.String padStr)
Right pad a String with a specified String.
|
static java.lang.String |
rotate(java.lang.String str,
int shift)
Rotate (circular shift) a String of
shift characters. |
static java.lang.String[] |
split(java.lang.String str)
Splits the provided text into an array, using whitespace as the
separator.
|
static java.lang.String[] |
split(java.lang.String str,
char separatorChar)
Splits the provided text into an array, separator specified.
|
static java.lang.String[] |
split(java.lang.String str,
java.lang.String separatorChars)
Splits the provided text into an array, separators specified.
|
static java.lang.String[] |
split(java.lang.String str,
java.lang.String separatorChars,
int max)
Splits the provided text into an array with a maximum length,
separators specified.
|
static java.lang.String[] |
splitByCharacterType(java.lang.String str)
Splits a String by Character type as returned by
java.lang.Character.getType(char) . |
static java.lang.String[] |
splitByCharacterTypeCamelCase(java.lang.String str)
Splits a String by Character type as returned by
java.lang.Character.getType(char) . |
static java.lang.String[] |
splitByWholeSeparator(java.lang.String str,
java.lang.String separator)
Splits the provided text into an array, separator string specified.
|
static java.lang.String[] |
splitByWholeSeparator(java.lang.String str,
java.lang.String separator,
int max)
Splits the provided text into an array, separator string specified.
|
static java.lang.String[] |
splitByWholeSeparatorPreserveAllTokens(java.lang.String str,
java.lang.String separator)
Splits the provided text into an array, separator string specified.
|
static java.lang.String[] |
splitByWholeSeparatorPreserveAllTokens(java.lang.String str,
java.lang.String separator,
int max)
Splits the provided text into an array, separator string specified.
|
static java.lang.String[] |
splitPreserveAllTokens(java.lang.String str)
Splits the provided text into an array, using whitespace as the
separator, preserving all tokens, including empty tokens created by
adjacent separators.
|
static java.lang.String[] |
splitPreserveAllTokens(java.lang.String str,
char separatorChar)
Splits the provided text into an array, separator specified,
preserving all tokens, including empty tokens created by adjacent
separators.
|
static java.lang.String[] |
splitPreserveAllTokens(java.lang.String str,
java.lang.String separatorChars)
Splits the provided text into an array, separators specified,
preserving all tokens, including empty tokens created by adjacent
separators.
|
static java.lang.String[] |
splitPreserveAllTokens(java.lang.String str,
java.lang.String separatorChars,
int max)
Splits the provided text into an array with a maximum length,
separators specified, preserving all tokens, including empty tokens
created by adjacent separators.
|
static boolean |
startsWith(java.lang.CharSequence str,
java.lang.CharSequence prefix)
Check if a CharSequence starts with a specified prefix.
|
static boolean |
startsWithAny(java.lang.CharSequence sequence,
java.lang.CharSequence... searchStrings)
Check if a CharSequence starts with any of the provided case-sensitive prefixes.
|
static boolean |
startsWithIgnoreCase(java.lang.CharSequence str,
java.lang.CharSequence prefix)
Case insensitive check if a CharSequence starts with a specified prefix.
|
static java.lang.String |
strip(java.lang.String str)
Strips whitespace from the start and end of a String.
|
static java.lang.String |
strip(java.lang.String str,
java.lang.String stripChars)
Strips any of a set of characters from the start and end of a String.
|
static java.lang.String |
stripAccents(java.lang.String input)
Removes diacritics (~= accents) from a string.
|
static java.lang.String[] |
stripAll(java.lang.String... strs)
Strips whitespace from the start and end of every String in an array.
|
static java.lang.String[] |
stripAll(java.lang.String[] strs,
java.lang.String stripChars)
Strips any of a set of characters from the start and end of every
String in an array.
|
static java.lang.String |
stripEnd(java.lang.String str,
java.lang.String stripChars)
Strips any of a set of characters from the end of a String.
|
static java.lang.String |
stripStart(java.lang.String str,
java.lang.String stripChars)
Strips any of a set of characters from the start of a String.
|
static java.lang.String |
stripToEmpty(java.lang.String str)
Strips whitespace from the start and end of a String returning
an empty String if
null input. |
static java.lang.String |
stripToNull(java.lang.String str)
Strips whitespace from the start and end of a String returning
null if the String is empty ("") after the strip. |
static java.lang.String |
substring(java.lang.String str,
int start)
Gets a substring from the specified String avoiding exceptions.
|
static java.lang.String |
substring(java.lang.String str,
int start,
int end)
Gets a substring from the specified String avoiding exceptions.
|
static java.lang.String |
substringAfter(java.lang.String str,
java.lang.String separator)
Gets the substring after the first occurrence of a separator.
|
static java.lang.String |
substringAfterLast(java.lang.String str,
java.lang.String separator)
Gets the substring after the last occurrence of a separator.
|
static java.lang.String |
substringBefore(java.lang.String str,
java.lang.String separator)
Gets the substring before the first occurrence of a separator.
|
static java.lang.String |
substringBeforeLast(java.lang.String str,
java.lang.String separator)
Gets the substring before the last occurrence of a separator.
|
static java.lang.String |
substringBetween(java.lang.String str,
java.lang.String tag)
Gets the String that is nested in between two instances of the
same String.
|
static java.lang.String |
substringBetween(java.lang.String str,
java.lang.String open,
java.lang.String close)
Gets the String that is nested in between two Strings.
|
static java.lang.String[] |
substringsBetween(java.lang.String str,
java.lang.String open,
java.lang.String close)
Searches a String for substrings delimited by a start and end tag,
returning all matching substrings in an array.
|
static java.lang.String |
swapCase(java.lang.String str)
Swaps the case of a String changing upper and title case to
lower case, and lower case to upper case.
|
static int[] |
toCodePoints(java.lang.CharSequence str)
Converts a
CharSequence into an array of code points. |
static java.lang.String |
toEncodedString(byte[] bytes,
java.nio.charset.Charset charset)
Converts a
byte[] to a String using the specified character encoding. |
static java.lang.String |
toString(byte[] bytes,
java.lang.String charsetName)
Deprecated.
use
toEncodedString(byte[], Charset) instead of String constants in your code |
static java.lang.String |
trim(java.lang.String str)
Removes control characters (char <= 32) from both
ends of this String, handling
null by returning
null . |
static java.lang.String |
trimToEmpty(java.lang.String str)
Removes control characters (char <= 32) from both
ends of this String returning an empty String ("") if the String
is empty ("") after the trim or if it is
null . |
static java.lang.String |
trimToNull(java.lang.String str)
Removes control characters (char <= 32) from both
ends of this String returning
null if the String is
empty ("") after the trim or if it is null . |
static java.lang.String |
truncate(java.lang.String str,
int maxWidth)
Truncates a String.
|
static java.lang.String |
truncate(java.lang.String str,
int offset,
int maxWidth)
Truncates a String.
|
static java.lang.String |
uncapitalize(java.lang.String str)
Uncapitalizes a String, changing the first character to lower case as
per
Character.toLowerCase(int) . |
static java.lang.String |
unwrap(java.lang.String str,
char wrapChar)
Unwraps a given string from a character.
|
static java.lang.String |
unwrap(java.lang.String str,
java.lang.String wrapToken)
Unwraps a given string from anther string.
|
static java.lang.String |
upperCase(java.lang.String str)
Converts a String to upper case as per
String.toUpperCase() . |
static java.lang.String |
upperCase(java.lang.String str,
java.util.Locale locale)
Converts a String to upper case as per
String.toUpperCase(Locale) . |
static java.lang.String |
valueOf(char[] value)
Returns the string representation of the
char array or null. |
static java.lang.String |
wrap(java.lang.String str,
char wrapWith)
Wraps a string with a char.
|
static java.lang.String |
wrap(java.lang.String str,
java.lang.String wrapWith)
Wraps a String with another String.
|
static java.lang.String |
wrapIfMissing(java.lang.String str,
char wrapWith)
Wraps a string with a char if that char is missing from the start or end of the given string.
|
static java.lang.String |
wrapIfMissing(java.lang.String str,
java.lang.String wrapWith)
Wraps a string with a string if that string is missing from the start or end of the given string.
|
public static final java.lang.String SPACE
public static final java.lang.String EMPTY
""
.public static final java.lang.String LF
public static final java.lang.String CR
public static final int INDEX_NOT_FOUND
public StringUtils()
StringUtils
instances should NOT be constructed in
standard programming. Instead, the class should be used as
StringUtils.trim(" foo ");
.
This constructor is public to permit tools that require a JavaBean instance to operate.
public static boolean isEmpty(java.lang.CharSequence cs)
Checks if a CharSequence is empty ("") or null.
StringUtils.isEmpty(null) = true StringUtils.isEmpty("") = true StringUtils.isEmpty(" ") = false StringUtils.isEmpty("bob") = false StringUtils.isEmpty(" bob ") = false
NOTE: This method changed in Lang version 2.0. It no longer trims the CharSequence. That functionality is available in isBlank().
cs
- the CharSequence to check, may be nulltrue
if the CharSequence is empty or nullpublic static boolean isNotEmpty(java.lang.CharSequence cs)
Checks if a CharSequence is not empty ("") and not null.
StringUtils.isNotEmpty(null) = false StringUtils.isNotEmpty("") = false StringUtils.isNotEmpty(" ") = true StringUtils.isNotEmpty("bob") = true StringUtils.isNotEmpty(" bob ") = true
cs
- the CharSequence to check, may be nulltrue
if the CharSequence is not empty and not nullpublic static boolean isAnyEmpty(java.lang.CharSequence... css)
Checks if any of the CharSequences are empty ("") or null.
StringUtils.isAnyEmpty((String) null) = true StringUtils.isAnyEmpty((String[]) null) = false StringUtils.isAnyEmpty(null, "foo") = true StringUtils.isAnyEmpty("", "bar") = true StringUtils.isAnyEmpty("bob", "") = true StringUtils.isAnyEmpty(" bob ", null) = true StringUtils.isAnyEmpty(" ", "bar") = false StringUtils.isAnyEmpty("foo", "bar") = false StringUtils.isAnyEmpty(new String[]{}) = false StringUtils.isAnyEmpty(new String[]{""}) = true
css
- the CharSequences to check, may be null or emptytrue
if any of the CharSequences are empty or nullpublic static boolean isNoneEmpty(java.lang.CharSequence... css)
Checks if none of the CharSequences are empty ("") or null.
StringUtils.isNoneEmpty((String) null) = false StringUtils.isNoneEmpty((String[]) null) = true StringUtils.isNoneEmpty(null, "foo") = false StringUtils.isNoneEmpty("", "bar") = false StringUtils.isNoneEmpty("bob", "") = false StringUtils.isNoneEmpty(" bob ", null) = false StringUtils.isNoneEmpty(new String[] {}) = true StringUtils.isNoneEmpty(new String[]{""}) = false StringUtils.isNoneEmpty(" ", "bar") = true StringUtils.isNoneEmpty("foo", "bar") = true
css
- the CharSequences to check, may be null or emptytrue
if none of the CharSequences are empty or nullpublic static boolean isAllEmpty(java.lang.CharSequence... css)
Checks if all of the CharSequences are empty ("") or null.
StringUtils.isAllEmpty(null) = true StringUtils.isAllEmpty(null, "") = true StringUtils.isAllEmpty(new String[] {}) = true StringUtils.isAllEmpty(null, "foo") = false StringUtils.isAllEmpty("", "bar") = false StringUtils.isAllEmpty("bob", "") = false StringUtils.isAllEmpty(" bob ", null) = false StringUtils.isAllEmpty(" ", "bar") = false StringUtils.isAllEmpty("foo", "bar") = false
css
- the CharSequences to check, may be null or emptytrue
if all of the CharSequences are empty or nullpublic static boolean isBlank(java.lang.CharSequence cs)
Checks if a CharSequence is empty (""), null or whitespace only.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.isBlank(null) = true StringUtils.isBlank("") = true StringUtils.isBlank(" ") = true StringUtils.isBlank("bob") = false StringUtils.isBlank(" bob ") = false
cs
- the CharSequence to check, may be nulltrue
if the CharSequence is null, empty or whitespace onlypublic static boolean isNotBlank(java.lang.CharSequence cs)
Checks if a CharSequence is not empty (""), not null and not whitespace only.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.isNotBlank(null) = false StringUtils.isNotBlank("") = false StringUtils.isNotBlank(" ") = false StringUtils.isNotBlank("bob") = true StringUtils.isNotBlank(" bob ") = true
cs
- the CharSequence to check, may be nulltrue
if the CharSequence is
not empty and not null and not whitespace onlypublic static boolean isAnyBlank(java.lang.CharSequence... css)
Checks if any of the CharSequences are empty ("") or null or whitespace only.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.isAnyBlank((String) null) = true StringUtils.isAnyBlank((String[]) null) = false StringUtils.isAnyBlank(null, "foo") = true StringUtils.isAnyBlank(null, null) = true StringUtils.isAnyBlank("", "bar") = true StringUtils.isAnyBlank("bob", "") = true StringUtils.isAnyBlank(" bob ", null) = true StringUtils.isAnyBlank(" ", "bar") = true StringUtils.isAnyBlank(new String[] {}) = false StringUtils.isAnyBlank(new String[]{""}) = true StringUtils.isAnyBlank("foo", "bar") = false
css
- the CharSequences to check, may be null or emptytrue
if any of the CharSequences are empty or null or whitespace onlypublic static boolean isNoneBlank(java.lang.CharSequence... css)
Checks if none of the CharSequences are empty (""), null or whitespace only.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.isNoneBlank((String) null) = false StringUtils.isNoneBlank((String[]) null) = true StringUtils.isNoneBlank(null, "foo") = false StringUtils.isNoneBlank(null, null) = false StringUtils.isNoneBlank("", "bar") = false StringUtils.isNoneBlank("bob", "") = false StringUtils.isNoneBlank(" bob ", null) = false StringUtils.isNoneBlank(" ", "bar") = false StringUtils.isNoneBlank(new String[] {}) = true StringUtils.isNoneBlank(new String[]{""}) = false StringUtils.isNoneBlank("foo", "bar") = true
css
- the CharSequences to check, may be null or emptytrue
if none of the CharSequences are empty or null or whitespace onlypublic static boolean isAllBlank(java.lang.CharSequence... css)
Checks if all of the CharSequences are empty (""), null or whitespace only.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.isAllBlank(null) = true StringUtils.isAllBlank(null, "foo") = false StringUtils.isAllBlank(null, null) = true StringUtils.isAllBlank("", "bar") = false StringUtils.isAllBlank("bob", "") = false StringUtils.isAllBlank(" bob ", null) = false StringUtils.isAllBlank(" ", "bar") = false StringUtils.isAllBlank("foo", "bar") = false StringUtils.isAllBlank(new String[] {}) = true
css
- the CharSequences to check, may be null or emptytrue
if all of the CharSequences are empty or null or whitespace onlypublic static java.lang.String trim(java.lang.String str)
Removes control characters (char <= 32) from both
ends of this String, handling null
by returning
null
.
The String is trimmed using String.trim()
.
Trim removes start and end characters <= 32.
To strip whitespace use strip(String)
.
To trim your choice of characters, use the
strip(String, String)
methods.
StringUtils.trim(null) = null StringUtils.trim("") = "" StringUtils.trim(" ") = "" StringUtils.trim("abc") = "abc" StringUtils.trim(" abc ") = "abc"
str
- the String to be trimmed, may be nullnull
if null String inputpublic static java.lang.String trimToNull(java.lang.String str)
Removes control characters (char <= 32) from both
ends of this String returning null
if the String is
empty ("") after the trim or if it is null
.
The String is trimmed using String.trim()
.
Trim removes start and end characters <= 32.
To strip whitespace use stripToNull(String)
.
StringUtils.trimToNull(null) = null StringUtils.trimToNull("") = null StringUtils.trimToNull(" ") = null StringUtils.trimToNull("abc") = "abc" StringUtils.trimToNull(" abc ") = "abc"
str
- the String to be trimmed, may be nullnull
if only chars <= 32, empty or null String inputpublic static java.lang.String trimToEmpty(java.lang.String str)
Removes control characters (char <= 32) from both
ends of this String returning an empty String ("") if the String
is empty ("") after the trim or if it is null
.
The String is trimmed using String.trim()
.
Trim removes start and end characters <= 32.
To strip whitespace use stripToEmpty(String)
.
StringUtils.trimToEmpty(null) = "" StringUtils.trimToEmpty("") = "" StringUtils.trimToEmpty(" ") = "" StringUtils.trimToEmpty("abc") = "abc" StringUtils.trimToEmpty(" abc ") = "abc"
str
- the String to be trimmed, may be nullnull
inputpublic static java.lang.String truncate(java.lang.String str, int maxWidth)
Truncates a String. This will turn "Now is the time for all good men" into "Now is the time for".
Specifically:
str
is less than maxWidth
characters
long, return it.substring(str, 0, maxWidth)
.maxWidth
is less than 0
, throw an
IllegalArgumentException
.maxWidth
.StringUtils.truncate(null, 0) = null StringUtils.truncate(null, 2) = null StringUtils.truncate("", 4) = "" StringUtils.truncate("abcdefg", 4) = "abcd" StringUtils.truncate("abcdefg", 6) = "abcdef" StringUtils.truncate("abcdefg", 7) = "abcdefg" StringUtils.truncate("abcdefg", 8) = "abcdefg" StringUtils.truncate("abcdefg", -1) = throws an IllegalArgumentException
str
- the String to truncate, may be nullmaxWidth
- maximum length of result String, must be positivenull
if null String inputpublic static java.lang.String truncate(java.lang.String str, int offset, int maxWidth)
Truncates a String. This will turn "Now is the time for all good men" into "is the time for all".
Works like truncate(String, int)
, but allows you to specify
a "left edge" offset.
Specifically:
str
is less than maxWidth
characters
long, return it.substring(str, offset, maxWidth)
.maxWidth
is less than 0
, throw an
IllegalArgumentException
.offset
is less than 0
, throw an
IllegalArgumentException
.maxWidth
.StringUtils.truncate(null, 0, 0) = null StringUtils.truncate(null, 2, 4) = null StringUtils.truncate("", 0, 10) = "" StringUtils.truncate("", 2, 10) = "" StringUtils.truncate("abcdefghij", 0, 3) = "abc" StringUtils.truncate("abcdefghij", 5, 6) = "fghij" StringUtils.truncate("raspberry peach", 10, 15) = "peach" StringUtils.truncate("abcdefghijklmno", 0, 10) = "abcdefghij" StringUtils.truncate("abcdefghijklmno", -1, 10) = throws an IllegalArgumentException StringUtils.truncate("abcdefghijklmno", Integer.MIN_VALUE, 10) = "abcdefghij" StringUtils.truncate("abcdefghijklmno", Integer.MIN_VALUE, Integer.MAX_VALUE) = "abcdefghijklmno" StringUtils.truncate("abcdefghijklmno", 0, Integer.MAX_VALUE) = "abcdefghijklmno" StringUtils.truncate("abcdefghijklmno", 1, 10) = "bcdefghijk" StringUtils.truncate("abcdefghijklmno", 2, 10) = "cdefghijkl" StringUtils.truncate("abcdefghijklmno", 3, 10) = "defghijklm" StringUtils.truncate("abcdefghijklmno", 4, 10) = "efghijklmn" StringUtils.truncate("abcdefghijklmno", 5, 10) = "fghijklmno" StringUtils.truncate("abcdefghijklmno", 5, 5) = "fghij" StringUtils.truncate("abcdefghijklmno", 5, 3) = "fgh" StringUtils.truncate("abcdefghijklmno", 10, 3) = "klm" StringUtils.truncate("abcdefghijklmno", 10, Integer.MAX_VALUE) = "klmno" StringUtils.truncate("abcdefghijklmno", 13, 1) = "n" StringUtils.truncate("abcdefghijklmno", 13, Integer.MAX_VALUE) = "no" StringUtils.truncate("abcdefghijklmno", 14, 1) = "o" StringUtils.truncate("abcdefghijklmno", 14, Integer.MAX_VALUE) = "o" StringUtils.truncate("abcdefghijklmno", 15, 1) = "" StringUtils.truncate("abcdefghijklmno", 15, Integer.MAX_VALUE) = "" StringUtils.truncate("abcdefghijklmno", Integer.MAX_VALUE, Integer.MAX_VALUE) = "" StringUtils.truncate("abcdefghij", 3, -1) = throws an IllegalArgumentException StringUtils.truncate("abcdefghij", -2, 4) = throws an IllegalArgumentException
str
- the String to check, may be nulloffset
- left edge of source StringmaxWidth
- maximum length of result String, must be positivenull
if null String inputpublic static java.lang.String strip(java.lang.String str)
Strips whitespace from the start and end of a String.
This is similar to trim(String)
but removes whitespace.
Whitespace is defined by Character.isWhitespace(char)
.
A null
input String returns null
.
StringUtils.strip(null) = null StringUtils.strip("") = "" StringUtils.strip(" ") = "" StringUtils.strip("abc") = "abc" StringUtils.strip(" abc") = "abc" StringUtils.strip("abc ") = "abc" StringUtils.strip(" abc ") = "abc" StringUtils.strip(" ab c ") = "ab c"
str
- the String to remove whitespace from, may be nullnull
if null String inputpublic static java.lang.String stripToNull(java.lang.String str)
Strips whitespace from the start and end of a String returning
null
if the String is empty ("") after the strip.
This is similar to trimToNull(String)
but removes whitespace.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.stripToNull(null) = null StringUtils.stripToNull("") = null StringUtils.stripToNull(" ") = null StringUtils.stripToNull("abc") = "abc" StringUtils.stripToNull(" abc") = "abc" StringUtils.stripToNull("abc ") = "abc" StringUtils.stripToNull(" abc ") = "abc" StringUtils.stripToNull(" ab c ") = "ab c"
str
- the String to be stripped, may be nullnull
if whitespace, empty or null String inputpublic static java.lang.String stripToEmpty(java.lang.String str)
Strips whitespace from the start and end of a String returning
an empty String if null
input.
This is similar to trimToEmpty(String)
but removes whitespace.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.stripToEmpty(null) = "" StringUtils.stripToEmpty("") = "" StringUtils.stripToEmpty(" ") = "" StringUtils.stripToEmpty("abc") = "abc" StringUtils.stripToEmpty(" abc") = "abc" StringUtils.stripToEmpty("abc ") = "abc" StringUtils.stripToEmpty(" abc ") = "abc" StringUtils.stripToEmpty(" ab c ") = "ab c"
str
- the String to be stripped, may be nullnull
inputpublic static java.lang.String strip(java.lang.String str, java.lang.String stripChars)
Strips any of a set of characters from the start and end of a String.
This is similar to String.trim()
but allows the characters
to be stripped to be controlled.
A null
input String returns null
.
An empty string ("") input returns the empty string.
If the stripChars String is null
, whitespace is
stripped as defined by Character.isWhitespace(char)
.
Alternatively use strip(String)
.
StringUtils.strip(null, *) = null StringUtils.strip("", *) = "" StringUtils.strip("abc", null) = "abc" StringUtils.strip(" abc", null) = "abc" StringUtils.strip("abc ", null) = "abc" StringUtils.strip(" abc ", null) = "abc" StringUtils.strip(" abcyx", "xyz") = " abc"
str
- the String to remove characters from, may be nullstripChars
- the characters to remove, null treated as whitespacenull
if null String inputpublic static java.lang.String stripStart(java.lang.String str, java.lang.String stripChars)
Strips any of a set of characters from the start of a String.
A null
input String returns null
.
An empty string ("") input returns the empty string.
If the stripChars String is null
, whitespace is
stripped as defined by Character.isWhitespace(char)
.
StringUtils.stripStart(null, *) = null StringUtils.stripStart("", *) = "" StringUtils.stripStart("abc", "") = "abc" StringUtils.stripStart("abc", null) = "abc" StringUtils.stripStart(" abc", null) = "abc" StringUtils.stripStart("abc ", null) = "abc " StringUtils.stripStart(" abc ", null) = "abc " StringUtils.stripStart("yxabc ", "xyz") = "abc "
str
- the String to remove characters from, may be nullstripChars
- the characters to remove, null treated as whitespacenull
if null String inputpublic static java.lang.String stripEnd(java.lang.String str, java.lang.String stripChars)
Strips any of a set of characters from the end of a String.
A null
input String returns null
.
An empty string ("") input returns the empty string.
If the stripChars String is null
, whitespace is
stripped as defined by Character.isWhitespace(char)
.
StringUtils.stripEnd(null, *) = null StringUtils.stripEnd("", *) = "" StringUtils.stripEnd("abc", "") = "abc" StringUtils.stripEnd("abc", null) = "abc" StringUtils.stripEnd(" abc", null) = " abc" StringUtils.stripEnd("abc ", null) = "abc" StringUtils.stripEnd(" abc ", null) = " abc" StringUtils.stripEnd(" abcyx", "xyz") = " abc" StringUtils.stripEnd("120.00", ".0") = "12"
str
- the String to remove characters from, may be nullstripChars
- the set of characters to remove, null treated as whitespacenull
if null String inputpublic static java.lang.String[] stripAll(java.lang.String... strs)
Strips whitespace from the start and end of every String in an array.
Whitespace is defined by Character.isWhitespace(char)
.
A new array is returned each time, except for length zero.
A null
array will return null
.
An empty array will return itself.
A null
array entry will be ignored.
StringUtils.stripAll(null) = null StringUtils.stripAll([]) = [] StringUtils.stripAll(["abc", " abc"]) = ["abc", "abc"] StringUtils.stripAll(["abc ", null]) = ["abc", null]
strs
- the array to remove whitespace from, may be nullnull
if null array inputpublic static java.lang.String[] stripAll(java.lang.String[] strs, java.lang.String stripChars)
Strips any of a set of characters from the start and end of every String in an array.
Whitespace is defined by Character.isWhitespace(char)
.
A new array is returned each time, except for length zero.
A null
array will return null
.
An empty array will return itself.
A null
array entry will be ignored.
A null
stripChars will strip whitespace as defined by
Character.isWhitespace(char)
.
StringUtils.stripAll(null, *) = null StringUtils.stripAll([], *) = [] StringUtils.stripAll(["abc", " abc"], null) = ["abc", "abc"] StringUtils.stripAll(["abc ", null], null) = ["abc", null] StringUtils.stripAll(["abc ", null], "yz") = ["abc ", null] StringUtils.stripAll(["yabcz", null], "yz") = ["abc", null]
strs
- the array to remove characters from, may be nullstripChars
- the characters to remove, null treated as whitespacenull
if null array inputpublic static java.lang.String stripAccents(java.lang.String input)
Removes diacritics (~= accents) from a string. The case will not be altered.
For instance, 'à' will be replaced by 'a'.
Note that ligatures will be left as is.
StringUtils.stripAccents(null) = null StringUtils.stripAccents("") = "" StringUtils.stripAccents("control") = "control" StringUtils.stripAccents("éclair") = "eclair"
input
- String to be strippedpublic static boolean equals(java.lang.CharSequence cs1, java.lang.CharSequence cs2)
Compares two CharSequences, returning true
if they represent
equal sequences of characters.
null
s are handled without exceptions. Two null
references are considered to be equal. The comparison is case sensitive.
StringUtils.equals(null, null) = true StringUtils.equals(null, "abc") = false StringUtils.equals("abc", null) = false StringUtils.equals("abc", "abc") = true StringUtils.equals("abc", "ABC") = false
cs1
- the first CharSequence, may be null
cs2
- the second CharSequence, may be null
true
if the CharSequences are equal (case-sensitive), or both null
Object.equals(Object)
,
equalsIgnoreCase(CharSequence, CharSequence)
public static boolean equalsIgnoreCase(java.lang.CharSequence cs1, java.lang.CharSequence cs2)
Compares two CharSequences, returning true
if they represent
equal sequences of characters, ignoring case.
null
s are handled without exceptions. Two null
references are considered equal. The comparison is case insensitive.
StringUtils.equalsIgnoreCase(null, null) = true StringUtils.equalsIgnoreCase(null, "abc") = false StringUtils.equalsIgnoreCase("abc", null) = false StringUtils.equalsIgnoreCase("abc", "abc") = true StringUtils.equalsIgnoreCase("abc", "ABC") = true
cs1
- the first CharSequence, may be null
cs2
- the second CharSequence, may be null
true
if the CharSequences are equal (case-insensitive), or both null
equals(CharSequence, CharSequence)
public static int compare(java.lang.String str1, java.lang.String str2)
Compare two Strings lexicographically, as per String.compareTo(String)
, returning :
int = 0
, if str1
is equal to str2
(or both null
)int < 0
, if str1
is less than str2
int > 0
, if str1
is greater than str2
This is a null
safe version of :
str1.compareTo(str2)
null
value is considered less than non-null
value.
Two null
references are considered equal.
StringUtils.compare(null, null) = 0 StringUtils.compare(null , "a") < 0 StringUtils.compare("a", null) > 0 StringUtils.compare("abc", "abc") = 0 StringUtils.compare("a", "b") < 0 StringUtils.compare("b", "a") > 0 StringUtils.compare("a", "B") > 0 StringUtils.compare("ab", "abc") < 0
str1
- the String to compare fromstr2
- the String to compare tostr1
is respectively less, equal or greater than str2
compare(String, String, boolean)
,
String.compareTo(String)
public static int compare(java.lang.String str1, java.lang.String str2, boolean nullIsLess)
Compare two Strings lexicographically, as per String.compareTo(String)
, returning :
int = 0
, if str1
is equal to str2
(or both null
)int < 0
, if str1
is less than str2
int > 0
, if str1
is greater than str2
This is a null
safe version of :
str1.compareTo(str2)
null
inputs are handled according to the nullIsLess
parameter.
Two null
references are considered equal.
StringUtils.compare(null, null, *) = 0 StringUtils.compare(null , "a", true) < 0 StringUtils.compare(null , "a", false) > 0 StringUtils.compare("a", null, true) > 0 StringUtils.compare("a", null, false) < 0 StringUtils.compare("abc", "abc", *) = 0 StringUtils.compare("a", "b", *) < 0 StringUtils.compare("b", "a", *) > 0 StringUtils.compare("a", "B", *) > 0 StringUtils.compare("ab", "abc", *) < 0
str1
- the String to compare fromstr2
- the String to compare tonullIsLess
- whether consider null
value less than non-null
valuestr1
is respectively less, equal ou greater than str2
String.compareTo(String)
public static int compareIgnoreCase(java.lang.String str1, java.lang.String str2)
Compare two Strings lexicographically, ignoring case differences,
as per String.compareToIgnoreCase(String)
, returning :
int = 0
, if str1
is equal to str2
(or both null
)int < 0
, if str1
is less than str2
int > 0
, if str1
is greater than str2
This is a null
safe version of :
str1.compareToIgnoreCase(str2)
null
value is considered less than non-null
value.
Two null
references are considered equal.
Comparison is case insensitive.
StringUtils.compareIgnoreCase(null, null) = 0 StringUtils.compareIgnoreCase(null , "a") < 0 StringUtils.compareIgnoreCase("a", null) > 0 StringUtils.compareIgnoreCase("abc", "abc") = 0 StringUtils.compareIgnoreCase("abc", "ABC") = 0 StringUtils.compareIgnoreCase("a", "b") < 0 StringUtils.compareIgnoreCase("b", "a") > 0 StringUtils.compareIgnoreCase("a", "B") < 0 StringUtils.compareIgnoreCase("A", "b") < 0 StringUtils.compareIgnoreCase("ab", "ABC") < 0
str1
- the String to compare fromstr2
- the String to compare tostr1
is respectively less, equal ou greater than str2
,
ignoring case differences.compareIgnoreCase(String, String, boolean)
,
String.compareToIgnoreCase(String)
public static int compareIgnoreCase(java.lang.String str1, java.lang.String str2, boolean nullIsLess)
Compare two Strings lexicographically, ignoring case differences,
as per String.compareToIgnoreCase(String)
, returning :
int = 0
, if str1
is equal to str2
(or both null
)int < 0
, if str1
is less than str2
int > 0
, if str1
is greater than str2
This is a null
safe version of :
str1.compareToIgnoreCase(str2)
null
inputs are handled according to the nullIsLess
parameter.
Two null
references are considered equal.
Comparison is case insensitive.
StringUtils.compareIgnoreCase(null, null, *) = 0 StringUtils.compareIgnoreCase(null , "a", true) < 0 StringUtils.compareIgnoreCase(null , "a", false) > 0 StringUtils.compareIgnoreCase("a", null, true) > 0 StringUtils.compareIgnoreCase("a", null, false) < 0 StringUtils.compareIgnoreCase("abc", "abc", *) = 0 StringUtils.compareIgnoreCase("abc", "ABC", *) = 0 StringUtils.compareIgnoreCase("a", "b", *) < 0 StringUtils.compareIgnoreCase("b", "a", *) > 0 StringUtils.compareIgnoreCase("a", "B", *) < 0 StringUtils.compareIgnoreCase("A", "b", *) < 0 StringUtils.compareIgnoreCase("ab", "abc", *) < 0
str1
- the String to compare fromstr2
- the String to compare tonullIsLess
- whether consider null
value less than non-null
valuestr1
is respectively less, equal ou greater than str2
,
ignoring case differences.String.compareToIgnoreCase(String)
public static boolean equalsAny(java.lang.CharSequence string, java.lang.CharSequence... searchStrings)
Compares given string
to a CharSequences vararg of searchStrings
,
returning true
if the string
is equal to any of the searchStrings
.
StringUtils.equalsAny(null, (CharSequence[]) null) = false StringUtils.equalsAny(null, null, null) = true StringUtils.equalsAny(null, "abc", "def") = false StringUtils.equalsAny("abc", null, "def") = false StringUtils.equalsAny("abc", "abc", "def") = true StringUtils.equalsAny("abc", "ABC", "DEF") = false
string
- to compare, may be null
.searchStrings
- a vararg of strings, may be null
.true
if the string is equal (case-sensitive) to any other element of searchStrings
;
false
if searchStrings
is null or contains no matches.public static boolean equalsAnyIgnoreCase(java.lang.CharSequence string, java.lang.CharSequence... searchStrings)
Compares given string
to a CharSequences vararg of searchStrings
,
returning true
if the string
is equal to any of the searchStrings
, ignoring case.
StringUtils.equalsAnyIgnoreCase(null, (CharSequence[]) null) = false StringUtils.equalsAnyIgnoreCase(null, null, null) = true StringUtils.equalsAnyIgnoreCase(null, "abc", "def") = false StringUtils.equalsAnyIgnoreCase("abc", null, "def") = false StringUtils.equalsAnyIgnoreCase("abc", "abc", "def") = true StringUtils.equalsAnyIgnoreCase("abc", "ABC", "DEF") = true
string
- to compare, may be null
.searchStrings
- a vararg of strings, may be null
.true
if the string is equal (case-insensitive) to any other element of searchStrings
;
false
if searchStrings
is null or contains no matches.public static int indexOf(java.lang.CharSequence seq, int searchChar)
seq
of the first occurrence of
the specified character. If a character with value
searchChar
occurs in the character sequence represented by
seq
CharSequence
object, then the index (in Unicode
code units) of the first such occurrence is returned. For
values of searchChar
in the range from 0 to 0xFFFF
(inclusive), this is the smallest value k such that:
is true. For other values ofthis.charAt(k) == searchChar
searchChar
, it is the
smallest value k such that:
is true. In either case, if no such character occurs inthis.codePointAt(k) == searchChar
seq
,
then INDEX_NOT_FOUND (-1)
is returned.
Furthermore, a null
or empty ("") CharSequence will
return INDEX_NOT_FOUND (-1)
.
StringUtils.indexOf(null, *) = -1 StringUtils.indexOf("", *) = -1 StringUtils.indexOf("aabaabaa", 'a') = 0 StringUtils.indexOf("aabaabaa", 'b') = 2
seq
- the CharSequence to check, may be nullsearchChar
- the character to findnull
string inputCharSequenceUtils
call to behave more like String
public static int indexOf(java.lang.CharSequence seq, int searchChar, int startPos)
seq
of the first occurrence of the
specified character, starting the search at the specified index.
If a character with value searchChar
occurs in the
character sequence represented by the seq
CharSequence
object at an index no smaller than startPos
, then
the index of the first such occurrence is returned. For values
of searchChar
in the range from 0 to 0xFFFF (inclusive),
this is the smallest value k such that:
is true. For other values of(this.charAt(k) == searchChar) && (k >= startPos)
searchChar
, it is the
smallest value k such that:
is true. In either case, if no such character occurs in(this.codePointAt(k) == searchChar) && (k >= startPos)
seq
at or after position startPos
, then
-1
is returned.
There is no restriction on the value of startPos
. If it
is negative, it has the same effect as if it were zero: this entire
string may be searched. If it is greater than the length of this
string, it has the same effect as if it were equal to the length of
this string: (INDEX_NOT_FOUND) -1
is returned. Furthermore, a
null
or empty ("") CharSequence will
return (INDEX_NOT_FOUND) -1
.
All indices are specified in char
values
(Unicode code units).
StringUtils.indexOf(null, *, *) = -1 StringUtils.indexOf("", *, *) = -1 StringUtils.indexOf("aabaabaa", 'b', 0) = 2 StringUtils.indexOf("aabaabaa", 'b', 3) = 5 StringUtils.indexOf("aabaabaa", 'b', 9) = -1 StringUtils.indexOf("aabaabaa", 'b', -1) = 2
seq
- the CharSequence to check, may be nullsearchChar
- the character to findstartPos
- the start position, negative treated as zeronull
string inputCharSequenceUtils
call to behave more like String
public static int indexOf(java.lang.CharSequence seq, java.lang.CharSequence searchSeq)
Finds the first index within a CharSequence, handling null
.
This method uses String.indexOf(String, int)
if possible.
A null
CharSequence will return -1
.
StringUtils.indexOf(null, *) = -1 StringUtils.indexOf(*, null) = -1 StringUtils.indexOf("", "") = 0 StringUtils.indexOf("", *) = -1 (except when * = "") StringUtils.indexOf("aabaabaa", "a") = 0 StringUtils.indexOf("aabaabaa", "b") = 2 StringUtils.indexOf("aabaabaa", "ab") = 1 StringUtils.indexOf("aabaabaa", "") = 0
seq
- the CharSequence to check, may be nullsearchSeq
- the CharSequence to find, may be nullnull
string inputpublic static int indexOf(java.lang.CharSequence seq, java.lang.CharSequence searchSeq, int startPos)
Finds the first index within a CharSequence, handling null
.
This method uses String.indexOf(String, int)
if possible.
A null
CharSequence will return -1
.
A negative start position is treated as zero.
An empty ("") search CharSequence always matches.
A start position greater than the string length only matches
an empty search CharSequence.
StringUtils.indexOf(null, *, *) = -1 StringUtils.indexOf(*, null, *) = -1 StringUtils.indexOf("", "", 0) = 0 StringUtils.indexOf("", *, 0) = -1 (except when * = "") StringUtils.indexOf("aabaabaa", "a", 0) = 0 StringUtils.indexOf("aabaabaa", "b", 0) = 2 StringUtils.indexOf("aabaabaa", "ab", 0) = 1 StringUtils.indexOf("aabaabaa", "b", 3) = 5 StringUtils.indexOf("aabaabaa", "b", 9) = -1 StringUtils.indexOf("aabaabaa", "b", -1) = 2 StringUtils.indexOf("aabaabaa", "", 2) = 2 StringUtils.indexOf("abc", "", 9) = 3
seq
- the CharSequence to check, may be nullsearchSeq
- the CharSequence to find, may be nullstartPos
- the start position, negative treated as zeronull
string inputpublic static int ordinalIndexOf(java.lang.CharSequence str, java.lang.CharSequence searchStr, int ordinal)
Finds the n-th index within a CharSequence, handling null
.
This method uses String.indexOf(String)
if possible.
Note: The code starts looking for a match at the start of the target,
incrementing the starting index by one after each successful match
(unless searchStr
is an empty string in which case the position
is never incremented and 0
is returned immediately).
This means that matches may overlap.
A null
CharSequence will return -1
.
StringUtils.ordinalIndexOf(null, *, *) = -1 StringUtils.ordinalIndexOf(*, null, *) = -1 StringUtils.ordinalIndexOf("", "", *) = 0 StringUtils.ordinalIndexOf("aabaabaa", "a", 1) = 0 StringUtils.ordinalIndexOf("aabaabaa", "a", 2) = 1 StringUtils.ordinalIndexOf("aabaabaa", "b", 1) = 2 StringUtils.ordinalIndexOf("aabaabaa", "b", 2) = 5 StringUtils.ordinalIndexOf("aabaabaa", "ab", 1) = 1 StringUtils.ordinalIndexOf("aabaabaa", "ab", 2) = 4 StringUtils.ordinalIndexOf("aabaabaa", "", 1) = 0 StringUtils.ordinalIndexOf("aabaabaa", "", 2) = 0
Matches may overlap:
StringUtils.ordinalIndexOf("ababab", "aba", 1) = 0 StringUtils.ordinalIndexOf("ababab", "aba", 2) = 2 StringUtils.ordinalIndexOf("ababab", "aba", 3) = -1 StringUtils.ordinalIndexOf("abababab", "abab", 1) = 0 StringUtils.ordinalIndexOf("abababab", "abab", 2) = 2 StringUtils.ordinalIndexOf("abababab", "abab", 3) = 4 StringUtils.ordinalIndexOf("abababab", "abab", 4) = -1
Note that 'head(CharSequence str, int n)' may be implemented as:
str.substring(0, lastOrdinalIndexOf(str, "\n", n))
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullordinal
- the n-th searchStr
to find-1
(INDEX_NOT_FOUND
) if no match or null
string inputpublic static int indexOfIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence searchStr)
Case in-sensitive find of the first index within a CharSequence.
A null
CharSequence will return -1
.
A negative start position is treated as zero.
An empty ("") search CharSequence always matches.
A start position greater than the string length only matches
an empty search CharSequence.
StringUtils.indexOfIgnoreCase(null, *) = -1 StringUtils.indexOfIgnoreCase(*, null) = -1 StringUtils.indexOfIgnoreCase("", "") = 0 StringUtils.indexOfIgnoreCase("aabaabaa", "a") = 0 StringUtils.indexOfIgnoreCase("aabaabaa", "b") = 2 StringUtils.indexOfIgnoreCase("aabaabaa", "ab") = 1
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullnull
string inputpublic static int indexOfIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence searchStr, int startPos)
Case in-sensitive find of the first index within a CharSequence from the specified position.
A null
CharSequence will return -1
.
A negative start position is treated as zero.
An empty ("") search CharSequence always matches.
A start position greater than the string length only matches
an empty search CharSequence.
StringUtils.indexOfIgnoreCase(null, *, *) = -1 StringUtils.indexOfIgnoreCase(*, null, *) = -1 StringUtils.indexOfIgnoreCase("", "", 0) = 0 StringUtils.indexOfIgnoreCase("aabaabaa", "A", 0) = 0 StringUtils.indexOfIgnoreCase("aabaabaa", "B", 0) = 2 StringUtils.indexOfIgnoreCase("aabaabaa", "AB", 0) = 1 StringUtils.indexOfIgnoreCase("aabaabaa", "B", 3) = 5 StringUtils.indexOfIgnoreCase("aabaabaa", "B", 9) = -1 StringUtils.indexOfIgnoreCase("aabaabaa", "B", -1) = 2 StringUtils.indexOfIgnoreCase("aabaabaa", "", 2) = 2 StringUtils.indexOfIgnoreCase("abc", "", 9) = -1
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullstartPos
- the start position, negative treated as zeronull
string inputpublic static int lastIndexOf(java.lang.CharSequence seq, int searchChar)
seq
of the last occurrence of
the specified character. For values of searchChar
in the
range from 0 to 0xFFFF (inclusive), the index (in Unicode code
units) returned is the largest value k such that:
is true. For other values ofthis.charAt(k) == searchChar
searchChar
, it is the
largest value k such that:
is true. In either case, if no such character occurs in this string, thenthis.codePointAt(k) == searchChar
-1
is returned. Furthermore, a null
or empty ("")
CharSequence
will return -1
. The
seq
CharSequence
object is searched backwards
starting at the last character.
StringUtils.lastIndexOf(null, *) = -1 StringUtils.lastIndexOf("", *) = -1 StringUtils.lastIndexOf("aabaabaa", 'a') = 7 StringUtils.lastIndexOf("aabaabaa", 'b') = 5
seq
- the CharSequence
to check, may be nullsearchChar
- the character to findnull
string inputCharSequenceUtils
call to behave more like String
public static int lastIndexOf(java.lang.CharSequence seq, int searchChar, int startPos)
seq
of the last occurrence of
the specified character, searching backward starting at the
specified index. For values of searchChar
in the range
from 0 to 0xFFFF (inclusive), the index returned is the largest
value k such that:
is true. For other values of(this.charAt(k) == searchChar) && (k <= startPos)
searchChar
, it is the
largest value k such that:
is true. In either case, if no such character occurs in(this.codePointAt(k) == searchChar) && (k <= startPos)
seq
at or before position startPos
, then
-1
is returned. Furthermore, a null
or empty ("")
CharSequence
will return -1
. A start position greater
than the string length searches the whole string.
The search starts at the startPos
and works backwards;
matches starting after the start position are ignored.
All indices are specified in char
values
(Unicode code units).
StringUtils.lastIndexOf(null, *, *) = -1 StringUtils.lastIndexOf("", *, *) = -1 StringUtils.lastIndexOf("aabaabaa", 'b', 8) = 5 StringUtils.lastIndexOf("aabaabaa", 'b', 4) = 2 StringUtils.lastIndexOf("aabaabaa", 'b', 0) = -1 StringUtils.lastIndexOf("aabaabaa", 'b', 9) = 5 StringUtils.lastIndexOf("aabaabaa", 'b', -1) = -1 StringUtils.lastIndexOf("aabaabaa", 'a', 0) = 0
seq
- the CharSequence to check, may be nullsearchChar
- the character to findstartPos
- the start positionnull
string inputpublic static int lastIndexOf(java.lang.CharSequence seq, java.lang.CharSequence searchSeq)
Finds the last index within a CharSequence, handling null
.
This method uses String.lastIndexOf(String)
if possible.
A null
CharSequence will return -1
.
StringUtils.lastIndexOf(null, *) = -1 StringUtils.lastIndexOf(*, null) = -1 StringUtils.lastIndexOf("", "") = 0 StringUtils.lastIndexOf("aabaabaa", "a") = 7 StringUtils.lastIndexOf("aabaabaa", "b") = 5 StringUtils.lastIndexOf("aabaabaa", "ab") = 4 StringUtils.lastIndexOf("aabaabaa", "") = 8
seq
- the CharSequence to check, may be nullsearchSeq
- the CharSequence to find, may be nullnull
string inputpublic static int lastOrdinalIndexOf(java.lang.CharSequence str, java.lang.CharSequence searchStr, int ordinal)
Finds the n-th last index within a String, handling null
.
This method uses String.lastIndexOf(String)
.
A null
String will return -1
.
StringUtils.lastOrdinalIndexOf(null, *, *) = -1 StringUtils.lastOrdinalIndexOf(*, null, *) = -1 StringUtils.lastOrdinalIndexOf("", "", *) = 0 StringUtils.lastOrdinalIndexOf("aabaabaa", "a", 1) = 7 StringUtils.lastOrdinalIndexOf("aabaabaa", "a", 2) = 6 StringUtils.lastOrdinalIndexOf("aabaabaa", "b", 1) = 5 StringUtils.lastOrdinalIndexOf("aabaabaa", "b", 2) = 2 StringUtils.lastOrdinalIndexOf("aabaabaa", "ab", 1) = 4 StringUtils.lastOrdinalIndexOf("aabaabaa", "ab", 2) = 1 StringUtils.lastOrdinalIndexOf("aabaabaa", "", 1) = 8 StringUtils.lastOrdinalIndexOf("aabaabaa", "", 2) = 8
Note that 'tail(CharSequence str, int n)' may be implemented as:
str.substring(lastOrdinalIndexOf(str, "\n", n) + 1)
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullordinal
- the n-th last searchStr
to find-1
(INDEX_NOT_FOUND
) if no match or null
string inputpublic static int lastIndexOf(java.lang.CharSequence seq, java.lang.CharSequence searchSeq, int startPos)
Finds the last index within a CharSequence, handling null
.
This method uses String.lastIndexOf(String, int)
if possible.
A null
CharSequence will return -1
.
A negative start position returns -1
.
An empty ("") search CharSequence always matches unless the start position is negative.
A start position greater than the string length searches the whole string.
The search starts at the startPos and works backwards; matches starting after the start
position are ignored.
StringUtils.lastIndexOf(null, *, *) = -1 StringUtils.lastIndexOf(*, null, *) = -1 StringUtils.lastIndexOf("aabaabaa", "a", 8) = 7 StringUtils.lastIndexOf("aabaabaa", "b", 8) = 5 StringUtils.lastIndexOf("aabaabaa", "ab", 8) = 4 StringUtils.lastIndexOf("aabaabaa", "b", 9) = 5 StringUtils.lastIndexOf("aabaabaa", "b", -1) = -1 StringUtils.lastIndexOf("aabaabaa", "a", 0) = 0 StringUtils.lastIndexOf("aabaabaa", "b", 0) = -1 StringUtils.lastIndexOf("aabaabaa", "b", 1) = -1 StringUtils.lastIndexOf("aabaabaa", "b", 2) = 2 StringUtils.lastIndexOf("aabaabaa", "ba", 2) = 2
seq
- the CharSequence to check, may be nullsearchSeq
- the CharSequence to find, may be nullstartPos
- the start position, negative treated as zeronull
string inputpublic static int lastIndexOfIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence searchStr)
Case in-sensitive find of the last index within a CharSequence.
A null
CharSequence will return -1
.
A negative start position returns -1
.
An empty ("") search CharSequence always matches unless the start position is negative.
A start position greater than the string length searches the whole string.
StringUtils.lastIndexOfIgnoreCase(null, *) = -1 StringUtils.lastIndexOfIgnoreCase(*, null) = -1 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "A") = 7 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B") = 5 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "AB") = 4
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullnull
string inputpublic static int lastIndexOfIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence searchStr, int startPos)
Case in-sensitive find of the last index within a CharSequence from the specified position.
A null
CharSequence will return -1
.
A negative start position returns -1
.
An empty ("") search CharSequence always matches unless the start position is negative.
A start position greater than the string length searches the whole string.
The search starts at the startPos and works backwards; matches starting after the start
position are ignored.
StringUtils.lastIndexOfIgnoreCase(null, *, *) = -1 StringUtils.lastIndexOfIgnoreCase(*, null, *) = -1 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "A", 8) = 7 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", 8) = 5 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "AB", 8) = 4 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", 9) = 5 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", -1) = -1 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "A", 0) = 0 StringUtils.lastIndexOfIgnoreCase("aabaabaa", "B", 0) = -1
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullstartPos
- the start positionnull
inputpublic static boolean contains(java.lang.CharSequence seq, int searchChar)
Checks if CharSequence contains a search character, handling null
.
This method uses String.indexOf(int)
if possible.
A null
or empty ("") CharSequence will return false
.
StringUtils.contains(null, *) = false StringUtils.contains("", *) = false StringUtils.contains("abc", 'a') = true StringUtils.contains("abc", 'z') = false
seq
- the CharSequence to check, may be nullsearchChar
- the character to findnull
string inputpublic static boolean contains(java.lang.CharSequence seq, java.lang.CharSequence searchSeq)
Checks if CharSequence contains a search CharSequence, handling null
.
This method uses String.indexOf(String)
if possible.
A null
CharSequence will return false
.
StringUtils.contains(null, *) = false StringUtils.contains(*, null) = false StringUtils.contains("", "") = true StringUtils.contains("abc", "") = true StringUtils.contains("abc", "a") = true StringUtils.contains("abc", "z") = false
seq
- the CharSequence to check, may be nullsearchSeq
- the CharSequence to find, may be nullnull
string inputpublic static boolean containsIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence searchStr)
Checks if CharSequence contains a search CharSequence irrespective of case,
handling null
. Case-insensitivity is defined as by
String.equalsIgnoreCase(String)
.
A null
CharSequence will return false
.
StringUtils.containsIgnoreCase(null, *) = false StringUtils.containsIgnoreCase(*, null) = false StringUtils.containsIgnoreCase("", "") = true StringUtils.containsIgnoreCase("abc", "") = true StringUtils.containsIgnoreCase("abc", "a") = true StringUtils.containsIgnoreCase("abc", "z") = false StringUtils.containsIgnoreCase("abc", "A") = true StringUtils.containsIgnoreCase("abc", "Z") = false
str
- the CharSequence to check, may be nullsearchStr
- the CharSequence to find, may be nullnull
string inputpublic static boolean containsWhitespace(java.lang.CharSequence seq)
Check whether the given CharSequence contains any whitespace characters.
Whitespace is defined by Character.isWhitespace(char)
.
seq
- the CharSequence to check (may be null
)true
if the CharSequence is not empty and
contains at least 1 (breaking) whitespace characterpublic static int indexOfAny(java.lang.CharSequence cs, char... searchChars)
Search a CharSequence to find the first index of any character in the given set of characters.
A null
String will return -1
.
A null
or zero length search array will return -1
.
StringUtils.indexOfAny(null, *) = -1 StringUtils.indexOfAny("", *) = -1 StringUtils.indexOfAny(*, null) = -1 StringUtils.indexOfAny(*, []) = -1 StringUtils.indexOfAny("zzabyycdxx", ['z', 'a']) = 0 StringUtils.indexOfAny("zzabyycdxx", ['b', 'y']) = 3 StringUtils.indexOfAny("aba", ['z']) = -1
cs
- the CharSequence to check, may be nullsearchChars
- the chars to search for, may be nullpublic static int indexOfAny(java.lang.CharSequence cs, java.lang.String searchChars)
Search a CharSequence to find the first index of any character in the given set of characters.
A null
String will return -1
.
A null
search string will return -1
.
StringUtils.indexOfAny(null, *) = -1 StringUtils.indexOfAny("", *) = -1 StringUtils.indexOfAny(*, null) = -1 StringUtils.indexOfAny(*, "") = -1 StringUtils.indexOfAny("zzabyycdxx", "za") = 0 StringUtils.indexOfAny("zzabyycdxx", "by") = 3 StringUtils.indexOfAny("aba", "z") = -1
cs
- the CharSequence to check, may be nullsearchChars
- the chars to search for, may be nullpublic static boolean containsAny(java.lang.CharSequence cs, char... searchChars)
Checks if the CharSequence contains any character in the given set of characters.
A null
CharSequence will return false
.
A null
or zero length search array will return false
.
StringUtils.containsAny(null, *) = false StringUtils.containsAny("", *) = false StringUtils.containsAny(*, null) = false StringUtils.containsAny(*, []) = false StringUtils.containsAny("zzabyycdxx", ['z', 'a']) = true StringUtils.containsAny("zzabyycdxx", ['b', 'y']) = true StringUtils.containsAny("zzabyycdxx", ['z', 'y']) = true StringUtils.containsAny("aba", ['z']) = false
cs
- the CharSequence to check, may be nullsearchChars
- the chars to search for, may be nulltrue
if any of the chars are found,
false
if no match or null inputpublic static boolean containsAny(java.lang.CharSequence cs, java.lang.CharSequence searchChars)
Checks if the CharSequence contains any character in the given set of characters.
A null
CharSequence will return false
. A null
search CharSequence will return
false
.
StringUtils.containsAny(null, *) = false StringUtils.containsAny("", *) = false StringUtils.containsAny(*, null) = false StringUtils.containsAny(*, "") = false StringUtils.containsAny("zzabyycdxx", "za") = true StringUtils.containsAny("zzabyycdxx", "by") = true StringUtils.containsAny("zzabyycdxx", "zy") = true StringUtils.containsAny("zzabyycdxx", "\tx") = true StringUtils.containsAny("zzabyycdxx", "$.#yF") = true StringUtils.containsAny("aba", "z") = false
cs
- the CharSequence to check, may be nullsearchChars
- the chars to search for, may be nulltrue
if any of the chars are found, false
if no match or null inputpublic static boolean containsAny(java.lang.CharSequence cs, java.lang.CharSequence... searchCharSequences)
Checks if the CharSequence contains any of the CharSequences in the given array.
A null
cs
CharSequence will return false
. A null
or zero
length search array will return false
.
StringUtils.containsAny(null, *) = false StringUtils.containsAny("", *) = false StringUtils.containsAny(*, null) = false StringUtils.containsAny(*, []) = false StringUtils.containsAny("abcd", "ab", null) = true StringUtils.containsAny("abcd", "ab", "cd") = true StringUtils.containsAny("abc", "d", "abc") = true
cs
- The CharSequence to check, may be nullsearchCharSequences
- The array of CharSequences to search for, may be null.
Individual CharSequences may be null as well.true
if any of the search CharSequences are found, false
otherwisepublic static int indexOfAnyBut(java.lang.CharSequence cs, char... searchChars)
Searches a CharSequence to find the first index of any character not in the given set of characters.
A null
CharSequence will return -1
.
A null
or zero length search array will return -1
.
StringUtils.indexOfAnyBut(null, *) = -1 StringUtils.indexOfAnyBut("", *) = -1 StringUtils.indexOfAnyBut(*, null) = -1 StringUtils.indexOfAnyBut(*, []) = -1 StringUtils.indexOfAnyBut("zzabyycdxx", new char[] {'z', 'a'} ) = 3 StringUtils.indexOfAnyBut("aba", new char[] {'z'} ) = 0 StringUtils.indexOfAnyBut("aba", new char[] {'a', 'b'} ) = -1
cs
- the CharSequence to check, may be nullsearchChars
- the chars to search for, may be nullpublic static int indexOfAnyBut(java.lang.CharSequence seq, java.lang.CharSequence searchChars)
Search a CharSequence to find the first index of any character not in the given set of characters.
A null
CharSequence will return -1
.
A null
or empty search string will return -1
.
StringUtils.indexOfAnyBut(null, *) = -1 StringUtils.indexOfAnyBut("", *) = -1 StringUtils.indexOfAnyBut(*, null) = -1 StringUtils.indexOfAnyBut(*, "") = -1 StringUtils.indexOfAnyBut("zzabyycdxx", "za") = 3 StringUtils.indexOfAnyBut("zzabyycdxx", "") = -1 StringUtils.indexOfAnyBut("aba", "ab") = -1
seq
- the CharSequence to check, may be nullsearchChars
- the chars to search for, may be nullpublic static boolean containsOnly(java.lang.CharSequence cs, char... valid)
Checks if the CharSequence contains only certain characters.
A null
CharSequence will return false
.
A null
valid character array will return false
.
An empty CharSequence (length()=0) always returns true
.
StringUtils.containsOnly(null, *) = false StringUtils.containsOnly(*, null) = false StringUtils.containsOnly("", *) = true StringUtils.containsOnly("ab", '') = false StringUtils.containsOnly("abab", 'abc') = true StringUtils.containsOnly("ab1", 'abc') = false StringUtils.containsOnly("abz", 'abc') = false
cs
- the String to check, may be nullvalid
- an array of valid chars, may be nullpublic static boolean containsOnly(java.lang.CharSequence cs, java.lang.String validChars)
Checks if the CharSequence contains only certain characters.
A null
CharSequence will return false
.
A null
valid character String will return false
.
An empty String (length()=0) always returns true
.
StringUtils.containsOnly(null, *) = false StringUtils.containsOnly(*, null) = false StringUtils.containsOnly("", *) = true StringUtils.containsOnly("ab", "") = false StringUtils.containsOnly("abab", "abc") = true StringUtils.containsOnly("ab1", "abc") = false StringUtils.containsOnly("abz", "abc") = false
cs
- the CharSequence to check, may be nullvalidChars
- a String of valid chars, may be nullpublic static boolean containsNone(java.lang.CharSequence cs, char... searchChars)
Checks that the CharSequence does not contain certain characters.
A null
CharSequence will return true
.
A null
invalid character array will return true
.
An empty CharSequence (length()=0) always returns true.
StringUtils.containsNone(null, *) = true StringUtils.containsNone(*, null) = true StringUtils.containsNone("", *) = true StringUtils.containsNone("ab", '') = true StringUtils.containsNone("abab", 'xyz') = true StringUtils.containsNone("ab1", 'xyz') = true StringUtils.containsNone("abz", 'xyz') = false
cs
- the CharSequence to check, may be nullsearchChars
- an array of invalid chars, may be nullpublic static boolean containsNone(java.lang.CharSequence cs, java.lang.String invalidChars)
Checks that the CharSequence does not contain certain characters.
A null
CharSequence will return true
.
A null
invalid character array will return true
.
An empty String ("") always returns true.
StringUtils.containsNone(null, *) = true StringUtils.containsNone(*, null) = true StringUtils.containsNone("", *) = true StringUtils.containsNone("ab", "") = true StringUtils.containsNone("abab", "xyz") = true StringUtils.containsNone("ab1", "xyz") = true StringUtils.containsNone("abz", "xyz") = false
cs
- the CharSequence to check, may be nullinvalidChars
- a String of invalid chars, may be nullpublic static int indexOfAny(java.lang.CharSequence str, java.lang.CharSequence... searchStrs)
Find the first index of any of a set of potential substrings.
A null
CharSequence will return -1
.
A null
or zero length search array will return -1
.
A null
search array entry will be ignored, but a search
array containing "" will return 0
if str
is not
null. This method uses String.indexOf(String)
if possible.
StringUtils.indexOfAny(null, *) = -1 StringUtils.indexOfAny(*, null) = -1 StringUtils.indexOfAny(*, []) = -1 StringUtils.indexOfAny("zzabyycdxx", ["ab", "cd"]) = 2 StringUtils.indexOfAny("zzabyycdxx", ["cd", "ab"]) = 2 StringUtils.indexOfAny("zzabyycdxx", ["mn", "op"]) = -1 StringUtils.indexOfAny("zzabyycdxx", ["zab", "aby"]) = 1 StringUtils.indexOfAny("zzabyycdxx", [""]) = 0 StringUtils.indexOfAny("", [""]) = 0 StringUtils.indexOfAny("", ["a"]) = -1
str
- the CharSequence to check, may be nullsearchStrs
- the CharSequences to search for, may be nullpublic static int lastIndexOfAny(java.lang.CharSequence str, java.lang.CharSequence... searchStrs)
Find the latest index of any of a set of potential substrings.
A null
CharSequence will return -1
.
A null
search array will return -1
.
A null
or zero length search array entry will be ignored,
but a search array containing "" will return the length of str
if str
is not null. This method uses String.indexOf(String)
if possible
StringUtils.lastIndexOfAny(null, *) = -1 StringUtils.lastIndexOfAny(*, null) = -1 StringUtils.lastIndexOfAny(*, []) = -1 StringUtils.lastIndexOfAny(*, [null]) = -1 StringUtils.lastIndexOfAny("zzabyycdxx", ["ab", "cd"]) = 6 StringUtils.lastIndexOfAny("zzabyycdxx", ["cd", "ab"]) = 6 StringUtils.lastIndexOfAny("zzabyycdxx", ["mn", "op"]) = -1 StringUtils.lastIndexOfAny("zzabyycdxx", ["mn", "op"]) = -1 StringUtils.lastIndexOfAny("zzabyycdxx", ["mn", ""]) = 10
str
- the CharSequence to check, may be nullsearchStrs
- the CharSequences to search for, may be nullpublic static java.lang.String substring(java.lang.String str, int start)
Gets a substring from the specified String avoiding exceptions.
A negative start position can be used to start n
characters from the end of the String.
A null
String will return null
.
An empty ("") String will return "".
StringUtils.substring(null, *) = null StringUtils.substring("", *) = "" StringUtils.substring("abc", 0) = "abc" StringUtils.substring("abc", 2) = "c" StringUtils.substring("abc", 4) = "" StringUtils.substring("abc", -2) = "bc" StringUtils.substring("abc", -4) = "abc"
str
- the String to get the substring from, may be nullstart
- the position to start from, negative means
count back from the end of the String by this many charactersnull
if null String inputpublic static java.lang.String substring(java.lang.String str, int start, int end)
Gets a substring from the specified String avoiding exceptions.
A negative start position can be used to start/end n
characters from the end of the String.
The returned substring starts with the character in the start
position and ends before the end
position. All position counting is
zero-based -- i.e., to start at the beginning of the string use
start = 0
. Negative start and end positions can be used to
specify offsets relative to the end of the String.
If start
is not strictly to the left of end
, ""
is returned.
StringUtils.substring(null, *, *) = null StringUtils.substring("", * , *) = ""; StringUtils.substring("abc", 0, 2) = "ab" StringUtils.substring("abc", 2, 0) = "" StringUtils.substring("abc", 2, 4) = "c" StringUtils.substring("abc", 4, 6) = "" StringUtils.substring("abc", 2, 2) = "" StringUtils.substring("abc", -2, -1) = "b" StringUtils.substring("abc", -4, 2) = "ab"
str
- the String to get the substring from, may be nullstart
- the position to start from, negative means
count back from the end of the String by this many charactersend
- the position to end at (exclusive), negative means
count back from the end of the String by this many charactersnull
if null String inputpublic static java.lang.String left(java.lang.String str, int len)
Gets the leftmost len
characters of a String.
If len
characters are not available, or the
String is null
, the String will be returned without
an exception. An empty String is returned if len is negative.
StringUtils.left(null, *) = null StringUtils.left(*, -ve) = "" StringUtils.left("", *) = "" StringUtils.left("abc", 0) = "" StringUtils.left("abc", 2) = "ab" StringUtils.left("abc", 4) = "abc"
str
- the String to get the leftmost characters from, may be nulllen
- the length of the required Stringnull
if null String inputpublic static java.lang.String right(java.lang.String str, int len)
Gets the rightmost len
characters of a String.
If len
characters are not available, or the String
is null
, the String will be returned without an
an exception. An empty String is returned if len is negative.
StringUtils.right(null, *) = null StringUtils.right(*, -ve) = "" StringUtils.right("", *) = "" StringUtils.right("abc", 0) = "" StringUtils.right("abc", 2) = "bc" StringUtils.right("abc", 4) = "abc"
str
- the String to get the rightmost characters from, may be nulllen
- the length of the required Stringnull
if null String inputpublic static java.lang.String mid(java.lang.String str, int pos, int len)
Gets len
characters from the middle of a String.
If len
characters are not available, the remainder
of the String will be returned without an exception. If the
String is null
, null
will be returned.
An empty String is returned if len is negative or exceeds the
length of str
.
StringUtils.mid(null, *, *) = null StringUtils.mid(*, *, -ve) = "" StringUtils.mid("", 0, *) = "" StringUtils.mid("abc", 0, 2) = "ab" StringUtils.mid("abc", 0, 4) = "abc" StringUtils.mid("abc", 2, 4) = "c" StringUtils.mid("abc", 4, 2) = "" StringUtils.mid("abc", -2, 2) = "ab"
str
- the String to get the characters from, may be nullpos
- the position to start from, negative treated as zerolen
- the length of the required Stringnull
if null String inputpublic static java.lang.String substringBefore(java.lang.String str, java.lang.String separator)
Gets the substring before the first occurrence of a separator. The separator is not returned.
A null
string input will return null
.
An empty ("") string input will return the empty string.
A null
separator will return the input string.
If nothing is found, the string input is returned.
StringUtils.substringBefore(null, *) = null StringUtils.substringBefore("", *) = "" StringUtils.substringBefore("abc", "a") = "" StringUtils.substringBefore("abcba", "b") = "a" StringUtils.substringBefore("abc", "c") = "ab" StringUtils.substringBefore("abc", "d") = "abc" StringUtils.substringBefore("abc", "") = "" StringUtils.substringBefore("abc", null) = "abc"
str
- the String to get a substring from, may be nullseparator
- the String to search for, may be nullnull
if null String inputpublic static java.lang.String substringAfter(java.lang.String str, java.lang.String separator)
Gets the substring after the first occurrence of a separator. The separator is not returned.
A null
string input will return null
.
An empty ("") string input will return the empty string.
A null
separator will return the empty string if the
input string is not null
.
If nothing is found, the empty string is returned.
StringUtils.substringAfter(null, *) = null StringUtils.substringAfter("", *) = "" StringUtils.substringAfter(*, null) = "" StringUtils.substringAfter("abc", "a") = "bc" StringUtils.substringAfter("abcba", "b") = "cba" StringUtils.substringAfter("abc", "c") = "" StringUtils.substringAfter("abc", "d") = "" StringUtils.substringAfter("abc", "") = "abc"
str
- the String to get a substring from, may be nullseparator
- the String to search for, may be nullnull
if null String inputpublic static java.lang.String substringBeforeLast(java.lang.String str, java.lang.String separator)
Gets the substring before the last occurrence of a separator. The separator is not returned.
A null
string input will return null
.
An empty ("") string input will return the empty string.
An empty or null
separator will return the input string.
If nothing is found, the string input is returned.
StringUtils.substringBeforeLast(null, *) = null StringUtils.substringBeforeLast("", *) = "" StringUtils.substringBeforeLast("abcba", "b") = "abc" StringUtils.substringBeforeLast("abc", "c") = "ab" StringUtils.substringBeforeLast("a", "a") = "" StringUtils.substringBeforeLast("a", "z") = "a" StringUtils.substringBeforeLast("a", null) = "a" StringUtils.substringBeforeLast("a", "") = "a"
str
- the String to get a substring from, may be nullseparator
- the String to search for, may be nullnull
if null String inputpublic static java.lang.String substringAfterLast(java.lang.String str, java.lang.String separator)
Gets the substring after the last occurrence of a separator. The separator is not returned.
A null
string input will return null
.
An empty ("") string input will return the empty string.
An empty or null
separator will return the empty string if
the input string is not null
.
If nothing is found, the empty string is returned.
StringUtils.substringAfterLast(null, *) = null StringUtils.substringAfterLast("", *) = "" StringUtils.substringAfterLast(*, "") = "" StringUtils.substringAfterLast(*, null) = "" StringUtils.substringAfterLast("abc", "a") = "bc" StringUtils.substringAfterLast("abcba", "b") = "a" StringUtils.substringAfterLast("abc", "c") = "" StringUtils.substringAfterLast("a", "a") = "" StringUtils.substringAfterLast("a", "z") = ""
str
- the String to get a substring from, may be nullseparator
- the String to search for, may be nullnull
if null String inputpublic static java.lang.String substringBetween(java.lang.String str, java.lang.String tag)
Gets the String that is nested in between two instances of the same String.
A null
input String returns null
.
A null
tag returns null
.
StringUtils.substringBetween(null, *) = null StringUtils.substringBetween("", "") = "" StringUtils.substringBetween("", "tag") = null StringUtils.substringBetween("tagabctag", null) = null StringUtils.substringBetween("tagabctag", "") = "" StringUtils.substringBetween("tagabctag", "tag") = "abc"
str
- the String containing the substring, may be nulltag
- the String before and after the substring, may be nullnull
if no matchpublic static java.lang.String substringBetween(java.lang.String str, java.lang.String open, java.lang.String close)
Gets the String that is nested in between two Strings. Only the first match is returned.
A null
input String returns null
.
A null
open/close returns null
(no match).
An empty ("") open and close returns an empty string.
StringUtils.substringBetween("wx[b]yz", "[", "]") = "b" StringUtils.substringBetween(null, *, *) = null StringUtils.substringBetween(*, null, *) = null StringUtils.substringBetween(*, *, null) = null StringUtils.substringBetween("", "", "") = "" StringUtils.substringBetween("", "", "]") = null StringUtils.substringBetween("", "[", "]") = null StringUtils.substringBetween("yabcz", "", "") = "" StringUtils.substringBetween("yabcz", "y", "z") = "abc" StringUtils.substringBetween("yabczyabcz", "y", "z") = "abc"
str
- the String containing the substring, may be nullopen
- the String before the substring, may be nullclose
- the String after the substring, may be nullnull
if no matchpublic static java.lang.String[] substringsBetween(java.lang.String str, java.lang.String open, java.lang.String close)
Searches a String for substrings delimited by a start and end tag, returning all matching substrings in an array.
A null
input String returns null
.
A null
open/close returns null
(no match).
An empty ("") open/close returns null
(no match).
StringUtils.substringsBetween("[a][b][c]", "[", "]") = ["a","b","c"] StringUtils.substringsBetween(null, *, *) = null StringUtils.substringsBetween(*, null, *) = null StringUtils.substringsBetween(*, *, null) = null StringUtils.substringsBetween("", "[", "]") = []
str
- the String containing the substrings, null returns null, empty returns emptyopen
- the String identifying the start of the substring, empty returns nullclose
- the String identifying the end of the substring, empty returns nullnull
if no matchpublic static java.lang.String[] split(java.lang.String str)
Splits the provided text into an array, using whitespace as the
separator.
Whitespace is defined by Character.isWhitespace(char)
.
The separator is not included in the returned String array. Adjacent separators are treated as one separator. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
StringUtils.split(null) = null StringUtils.split("") = [] StringUtils.split("abc def") = ["abc", "def"] StringUtils.split("abc def") = ["abc", "def"] StringUtils.split(" abc ") = ["abc"]
str
- the String to parse, may be nullnull
if null String inputpublic static java.lang.String[] split(java.lang.String str, char separatorChar)
Splits the provided text into an array, separator specified. This is an alternative to using StringTokenizer.
The separator is not included in the returned String array. Adjacent separators are treated as one separator. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
StringUtils.split(null, *) = null StringUtils.split("", *) = [] StringUtils.split("a.b.c", '.') = ["a", "b", "c"] StringUtils.split("a..b.c", '.') = ["a", "b", "c"] StringUtils.split("a:b:c", '.') = ["a:b:c"] StringUtils.split("a b c", ' ') = ["a", "b", "c"]
str
- the String to parse, may be nullseparatorChar
- the character used as the delimiternull
if null String inputpublic static java.lang.String[] split(java.lang.String str, java.lang.String separatorChars)
Splits the provided text into an array, separators specified. This is an alternative to using StringTokenizer.
The separator is not included in the returned String array. Adjacent separators are treated as one separator. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
A null
separatorChars splits on whitespace.
StringUtils.split(null, *) = null StringUtils.split("", *) = [] StringUtils.split("abc def", null) = ["abc", "def"] StringUtils.split("abc def", " ") = ["abc", "def"] StringUtils.split("abc def", " ") = ["abc", "def"] StringUtils.split("ab:cd:ef", ":") = ["ab", "cd", "ef"]
str
- the String to parse, may be nullseparatorChars
- the characters used as the delimiters,
null
splits on whitespacenull
if null String inputpublic static java.lang.String[] split(java.lang.String str, java.lang.String separatorChars, int max)
Splits the provided text into an array with a maximum length, separators specified.
The separator is not included in the returned String array. Adjacent separators are treated as one separator.
A null
input String returns null
.
A null
separatorChars splits on whitespace.
If more than max
delimited substrings are found, the last
returned string includes all characters after the first max - 1
returned strings (including separator characters).
StringUtils.split(null, *, *) = null StringUtils.split("", *, *) = [] StringUtils.split("ab cd ef", null, 0) = ["ab", "cd", "ef"] StringUtils.split("ab cd ef", null, 0) = ["ab", "cd", "ef"] StringUtils.split("ab:cd:ef", ":", 0) = ["ab", "cd", "ef"] StringUtils.split("ab:cd:ef", ":", 2) = ["ab", "cd:ef"]
str
- the String to parse, may be nullseparatorChars
- the characters used as the delimiters,
null
splits on whitespacemax
- the maximum number of elements to include in the
array. A zero or negative value implies no limitnull
if null String inputpublic static java.lang.String[] splitByWholeSeparator(java.lang.String str, java.lang.String separator)
Splits the provided text into an array, separator string specified.
The separator(s) will not be included in the returned String array. Adjacent separators are treated as one separator.
A null
input String returns null
.
A null
separator splits on whitespace.
StringUtils.splitByWholeSeparator(null, *) = null StringUtils.splitByWholeSeparator("", *) = [] StringUtils.splitByWholeSeparator("ab de fg", null) = ["ab", "de", "fg"] StringUtils.splitByWholeSeparator("ab de fg", null) = ["ab", "de", "fg"] StringUtils.splitByWholeSeparator("ab:cd:ef", ":") = ["ab", "cd", "ef"] StringUtils.splitByWholeSeparator("ab-!-cd-!-ef", "-!-") = ["ab", "cd", "ef"]
str
- the String to parse, may be nullseparator
- String containing the String to be used as a delimiter,
null
splits on whitespacenull
if null String was inputpublic static java.lang.String[] splitByWholeSeparator(java.lang.String str, java.lang.String separator, int max)
Splits the provided text into an array, separator string specified.
Returns a maximum of max
substrings.
The separator(s) will not be included in the returned String array. Adjacent separators are treated as one separator.
A null
input String returns null
.
A null
separator splits on whitespace.
StringUtils.splitByWholeSeparator(null, *, *) = null StringUtils.splitByWholeSeparator("", *, *) = [] StringUtils.splitByWholeSeparator("ab de fg", null, 0) = ["ab", "de", "fg"] StringUtils.splitByWholeSeparator("ab de fg", null, 0) = ["ab", "de", "fg"] StringUtils.splitByWholeSeparator("ab:cd:ef", ":", 2) = ["ab", "cd:ef"] StringUtils.splitByWholeSeparator("ab-!-cd-!-ef", "-!-", 5) = ["ab", "cd", "ef"] StringUtils.splitByWholeSeparator("ab-!-cd-!-ef", "-!-", 2) = ["ab", "cd-!-ef"]
str
- the String to parse, may be nullseparator
- String containing the String to be used as a delimiter,
null
splits on whitespacemax
- the maximum number of elements to include in the returned
array. A zero or negative value implies no limit.null
if null String was inputpublic static java.lang.String[] splitByWholeSeparatorPreserveAllTokens(java.lang.String str, java.lang.String separator)
Splits the provided text into an array, separator string specified.
The separator is not included in the returned String array. Adjacent separators are treated as separators for empty tokens. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
A null
separator splits on whitespace.
StringUtils.splitByWholeSeparatorPreserveAllTokens(null, *) = null StringUtils.splitByWholeSeparatorPreserveAllTokens("", *) = [] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab de fg", null) = ["ab", "de", "fg"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab de fg", null) = ["ab", "", "", "de", "fg"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab:cd:ef", ":") = ["ab", "cd", "ef"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab-!-cd-!-ef", "-!-") = ["ab", "cd", "ef"]
str
- the String to parse, may be nullseparator
- String containing the String to be used as a delimiter,
null
splits on whitespacenull
if null String was inputpublic static java.lang.String[] splitByWholeSeparatorPreserveAllTokens(java.lang.String str, java.lang.String separator, int max)
Splits the provided text into an array, separator string specified.
Returns a maximum of max
substrings.
The separator is not included in the returned String array. Adjacent separators are treated as separators for empty tokens. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
A null
separator splits on whitespace.
StringUtils.splitByWholeSeparatorPreserveAllTokens(null, *, *) = null StringUtils.splitByWholeSeparatorPreserveAllTokens("", *, *) = [] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab de fg", null, 0) = ["ab", "de", "fg"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab de fg", null, 0) = ["ab", "", "", "de", "fg"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab:cd:ef", ":", 2) = ["ab", "cd:ef"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab-!-cd-!-ef", "-!-", 5) = ["ab", "cd", "ef"] StringUtils.splitByWholeSeparatorPreserveAllTokens("ab-!-cd-!-ef", "-!-", 2) = ["ab", "cd-!-ef"]
str
- the String to parse, may be nullseparator
- String containing the String to be used as a delimiter,
null
splits on whitespacemax
- the maximum number of elements to include in the returned
array. A zero or negative value implies no limit.null
if null String was inputpublic static java.lang.String[] splitPreserveAllTokens(java.lang.String str)
Splits the provided text into an array, using whitespace as the
separator, preserving all tokens, including empty tokens created by
adjacent separators. This is an alternative to using StringTokenizer.
Whitespace is defined by Character.isWhitespace(char)
.
The separator is not included in the returned String array. Adjacent separators are treated as separators for empty tokens. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
StringUtils.splitPreserveAllTokens(null) = null StringUtils.splitPreserveAllTokens("") = [] StringUtils.splitPreserveAllTokens("abc def") = ["abc", "def"] StringUtils.splitPreserveAllTokens("abc def") = ["abc", "", "def"] StringUtils.splitPreserveAllTokens(" abc ") = ["", "abc", ""]
str
- the String to parse, may be null
null
if null String inputpublic static java.lang.String[] splitPreserveAllTokens(java.lang.String str, char separatorChar)
Splits the provided text into an array, separator specified, preserving all tokens, including empty tokens created by adjacent separators. This is an alternative to using StringTokenizer.
The separator is not included in the returned String array. Adjacent separators are treated as separators for empty tokens. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
StringUtils.splitPreserveAllTokens(null, *) = null StringUtils.splitPreserveAllTokens("", *) = [] StringUtils.splitPreserveAllTokens("a.b.c", '.') = ["a", "b", "c"] StringUtils.splitPreserveAllTokens("a..b.c", '.') = ["a", "", "b", "c"] StringUtils.splitPreserveAllTokens("a:b:c", '.') = ["a:b:c"] StringUtils.splitPreserveAllTokens("a\tb\nc", null) = ["a", "b", "c"] StringUtils.splitPreserveAllTokens("a b c", ' ') = ["a", "b", "c"] StringUtils.splitPreserveAllTokens("a b c ", ' ') = ["a", "b", "c", ""] StringUtils.splitPreserveAllTokens("a b c ", ' ') = ["a", "b", "c", "", ""] StringUtils.splitPreserveAllTokens(" a b c", ' ') = ["", a", "b", "c"] StringUtils.splitPreserveAllTokens(" a b c", ' ') = ["", "", a", "b", "c"] StringUtils.splitPreserveAllTokens(" a b c ", ' ') = ["", a", "b", "c", ""]
str
- the String to parse, may be null
separatorChar
- the character used as the delimiter,
null
splits on whitespacenull
if null String inputpublic static java.lang.String[] splitPreserveAllTokens(java.lang.String str, java.lang.String separatorChars)
Splits the provided text into an array, separators specified, preserving all tokens, including empty tokens created by adjacent separators. This is an alternative to using StringTokenizer.
The separator is not included in the returned String array. Adjacent separators are treated as separators for empty tokens. For more control over the split use the StrTokenizer class.
A null
input String returns null
.
A null
separatorChars splits on whitespace.
StringUtils.splitPreserveAllTokens(null, *) = null StringUtils.splitPreserveAllTokens("", *) = [] StringUtils.splitPreserveAllTokens("abc def", null) = ["abc", "def"] StringUtils.splitPreserveAllTokens("abc def", " ") = ["abc", "def"] StringUtils.splitPreserveAllTokens("abc def", " ") = ["abc", "", def"] StringUtils.splitPreserveAllTokens("ab:cd:ef", ":") = ["ab", "cd", "ef"] StringUtils.splitPreserveAllTokens("ab:cd:ef:", ":") = ["ab", "cd", "ef", ""] StringUtils.splitPreserveAllTokens("ab:cd:ef::", ":") = ["ab", "cd", "ef", "", ""] StringUtils.splitPreserveAllTokens("ab::cd:ef", ":") = ["ab", "", cd", "ef"] StringUtils.splitPreserveAllTokens(":cd:ef", ":") = ["", cd", "ef"] StringUtils.splitPreserveAllTokens("::cd:ef", ":") = ["", "", cd", "ef"] StringUtils.splitPreserveAllTokens(":cd:ef:", ":") = ["", cd", "ef", ""]
str
- the String to parse, may be null
separatorChars
- the characters used as the delimiters,
null
splits on whitespacenull
if null String inputpublic static java.lang.String[] splitPreserveAllTokens(java.lang.String str, java.lang.String separatorChars, int max)
Splits the provided text into an array with a maximum length, separators specified, preserving all tokens, including empty tokens created by adjacent separators.
The separator is not included in the returned String array. Adjacent separators are treated as separators for empty tokens. Adjacent separators are treated as one separator.
A null
input String returns null
.
A null
separatorChars splits on whitespace.
If more than max
delimited substrings are found, the last
returned string includes all characters after the first max - 1
returned strings (including separator characters).
StringUtils.splitPreserveAllTokens(null, *, *) = null StringUtils.splitPreserveAllTokens("", *, *) = [] StringUtils.splitPreserveAllTokens("ab de fg", null, 0) = ["ab", "cd", "ef"] StringUtils.splitPreserveAllTokens("ab de fg", null, 0) = ["ab", "cd", "ef"] StringUtils.splitPreserveAllTokens("ab:cd:ef", ":", 0) = ["ab", "cd", "ef"] StringUtils.splitPreserveAllTokens("ab:cd:ef", ":", 2) = ["ab", "cd:ef"] StringUtils.splitPreserveAllTokens("ab de fg", null, 2) = ["ab", " de fg"] StringUtils.splitPreserveAllTokens("ab de fg", null, 3) = ["ab", "", " de fg"] StringUtils.splitPreserveAllTokens("ab de fg", null, 4) = ["ab", "", "", "de fg"]
str
- the String to parse, may be null
separatorChars
- the characters used as the delimiters,
null
splits on whitespacemax
- the maximum number of elements to include in the
array. A zero or negative value implies no limitnull
if null String inputpublic static java.lang.String[] splitByCharacterType(java.lang.String str)
Splits a String by Character type as returned by
java.lang.Character.getType(char)
. Groups of contiguous
characters of the same type are returned as complete tokens.
StringUtils.splitByCharacterType(null) = null StringUtils.splitByCharacterType("") = [] StringUtils.splitByCharacterType("ab de fg") = ["ab", " ", "de", " ", "fg"] StringUtils.splitByCharacterType("ab de fg") = ["ab", " ", "de", " ", "fg"] StringUtils.splitByCharacterType("ab:cd:ef") = ["ab", ":", "cd", ":", "ef"] StringUtils.splitByCharacterType("number5") = ["number", "5"] StringUtils.splitByCharacterType("fooBar") = ["foo", "B", "ar"] StringUtils.splitByCharacterType("foo200Bar") = ["foo", "200", "B", "ar"] StringUtils.splitByCharacterType("ASFRules") = ["ASFR", "ules"]
str
- the String to split, may be null
null
if null String inputpublic static java.lang.String[] splitByCharacterTypeCamelCase(java.lang.String str)
Splits a String by Character type as returned by
java.lang.Character.getType(char)
. Groups of contiguous
characters of the same type are returned as complete tokens, with the
following exception: the character of type
Character.UPPERCASE_LETTER
, if any, immediately
preceding a token of type Character.LOWERCASE_LETTER
will belong to the following token rather than to the preceding, if any,
Character.UPPERCASE_LETTER
token.
StringUtils.splitByCharacterTypeCamelCase(null) = null StringUtils.splitByCharacterTypeCamelCase("") = [] StringUtils.splitByCharacterTypeCamelCase("ab de fg") = ["ab", " ", "de", " ", "fg"] StringUtils.splitByCharacterTypeCamelCase("ab de fg") = ["ab", " ", "de", " ", "fg"] StringUtils.splitByCharacterTypeCamelCase("ab:cd:ef") = ["ab", ":", "cd", ":", "ef"] StringUtils.splitByCharacterTypeCamelCase("number5") = ["number", "5"] StringUtils.splitByCharacterTypeCamelCase("fooBar") = ["foo", "Bar"] StringUtils.splitByCharacterTypeCamelCase("foo200Bar") = ["foo", "200", "Bar"] StringUtils.splitByCharacterTypeCamelCase("ASFRules") = ["ASF", "Rules"]
str
- the String to split, may be null
null
if null String input@SafeVarargs public static <T> java.lang.String join(T... elements)
Joins the elements of the provided array into a single String containing the provided list of elements.
No separator is added to the joined String. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null) = null StringUtils.join([]) = "" StringUtils.join([null]) = "" StringUtils.join(["a", "b", "c"]) = "abc" StringUtils.join([null, "", "a"]) = "a"
T
- the specific type of values to join togetherelements
- the values to join together, may be nullnull
if null array inputpublic static java.lang.String join(java.lang.Object[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join(["a", "b", "c"], ';') = "a;b;c" StringUtils.join(["a", "b", "c"], null) = "abc" StringUtils.join([null, "", "a"], ';') = ";;a"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(long[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(int[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(short[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(byte[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(char[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(float[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(double[] array, char separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usenull
if null array inputpublic static java.lang.String join(java.lang.Object[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join(["a", "b", "c"], ';') = "a;b;c" StringUtils.join(["a", "b", "c"], null) = "abc" StringUtils.join([null, "", "a"], ';') = ";;a"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is
an error to pass in a start index past the end of the arrayendIndex
- the index to stop joining from (exclusive). It is
an error to pass in an end index past the end of the arraynull
if null array inputpublic static java.lang.String join(long[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(int[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(byte[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(short[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(char[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(double[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(float[] array, char separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join([1, 2, 3], ';') = "1;2;3" StringUtils.join([1, 2, 3], null) = "123"
array
- the array of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is an error to pass in a start index past the end of the
arrayendIndex
- the index to stop joining from (exclusive). It is an error to pass in an end index past the end of
the arraynull
if null array inputpublic static java.lang.String join(java.lang.Object[] array, java.lang.String separator)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list.
A null
separator is the same as an empty String ("").
Null objects or empty strings within the array are represented by
empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join(["a", "b", "c"], "--") = "a--b--c" StringUtils.join(["a", "b", "c"], null) = "abc" StringUtils.join(["a", "b", "c"], "") = "abc" StringUtils.join([null, "", "a"], ',') = ",,a"
array
- the array of values to join together, may be nullseparator
- the separator character to use, null treated as ""null
if null array inputpublic static java.lang.String join(java.lang.Object[] array, java.lang.String separator, int startIndex, int endIndex)
Joins the elements of the provided array into a single String containing the provided list of elements.
No delimiter is added before or after the list.
A null
separator is the same as an empty String ("").
Null objects or empty strings within the array are represented by
empty strings.
StringUtils.join(null, *, *, *) = null StringUtils.join([], *, *, *) = "" StringUtils.join([null], *, *, *) = "" StringUtils.join(["a", "b", "c"], "--", 0, 3) = "a--b--c" StringUtils.join(["a", "b", "c"], "--", 1, 3) = "b--c" StringUtils.join(["a", "b", "c"], "--", 2, 3) = "c" StringUtils.join(["a", "b", "c"], "--", 2, 2) = "" StringUtils.join(["a", "b", "c"], null, 0, 3) = "abc" StringUtils.join(["a", "b", "c"], "", 0, 3) = "abc" StringUtils.join([null, "", "a"], ',', 0, 3) = ",,a"
array
- the array of values to join together, may be nullseparator
- the separator character to use, null treated as ""startIndex
- the first index to start joining from.endIndex
- the index to stop joining from (exclusive).null
if null array input; or the empty string
if endIndex - startIndex <= 0
. The number of joined entries is given by
endIndex - startIndex
java.lang.ArrayIndexOutOfBoundsException
- ifestartIndex < 0
or startIndex >= array.length()
or endIndex < 0
or endIndex > array.length()
public static java.lang.String join(java.util.Iterator<?> iterator, char separator)
Joins the elements of the provided Iterator
into
a single String containing the provided elements.
No delimiter is added before or after the list. Null objects or empty strings within the iteration are represented by empty strings.
See the examples here: join(Object[],char)
.
iterator
- the Iterator
of values to join together, may be nullseparator
- the separator character to usenull
if null iterator inputpublic static java.lang.String join(java.util.Iterator<?> iterator, java.lang.String separator)
Joins the elements of the provided Iterator
into
a single String containing the provided elements.
No delimiter is added before or after the list.
A null
separator is the same as an empty String ("").
See the examples here: join(Object[],String)
.
iterator
- the Iterator
of values to join together, may be nullseparator
- the separator character to use, null treated as ""null
if null iterator inputpublic static java.lang.String join(java.lang.Iterable<?> iterable, char separator)
Joins the elements of the provided Iterable
into
a single String containing the provided elements.
No delimiter is added before or after the list. Null objects or empty strings within the iteration are represented by empty strings.
See the examples here: join(Object[],char)
.
iterable
- the Iterable
providing the values to join together, may be nullseparator
- the separator character to usenull
if null iterator inputpublic static java.lang.String join(java.lang.Iterable<?> iterable, java.lang.String separator)
Joins the elements of the provided Iterable
into
a single String containing the provided elements.
No delimiter is added before or after the list.
A null
separator is the same as an empty String ("").
See the examples here: join(Object[],String)
.
iterable
- the Iterable
providing the values to join together, may be nullseparator
- the separator character to use, null treated as ""null
if null iterator inputpublic static java.lang.String join(java.util.List<?> list, char separator, int startIndex, int endIndex)
Joins the elements of the provided List
into a single String
containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join(["a", "b", "c"], ';') = "a;b;c" StringUtils.join(["a", "b", "c"], null) = "abc" StringUtils.join([null, "", "a"], ';') = ";;a"
list
- the List
of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is
an error to pass in a start index past the end of the listendIndex
- the index to stop joining from (exclusive). It is
an error to pass in an end index past the end of the listnull
if null list inputpublic static java.lang.String join(java.util.List<?> list, java.lang.String separator, int startIndex, int endIndex)
Joins the elements of the provided List
into a single String
containing the provided list of elements.
No delimiter is added before or after the list. Null objects or empty strings within the array are represented by empty strings.
StringUtils.join(null, *) = null StringUtils.join([], *) = "" StringUtils.join([null], *) = "" StringUtils.join(["a", "b", "c"], ';') = "a;b;c" StringUtils.join(["a", "b", "c"], null) = "abc" StringUtils.join([null, "", "a"], ';') = ";;a"
list
- the List
of values to join together, may be nullseparator
- the separator character to usestartIndex
- the first index to start joining from. It is
an error to pass in a start index past the end of the listendIndex
- the index to stop joining from (exclusive). It is
an error to pass in an end index past the end of the listnull
if null list inputpublic static java.lang.String joinWith(java.lang.String separator, java.lang.Object... objects)
Joins the elements of the provided varargs into a single String containing the provided elements.
No delimiter is added before or after the list.
null
elements and separator are treated as empty Strings ("").
StringUtils.joinWith(",", {"a", "b"}) = "a,b" StringUtils.joinWith(",", {"a", "b",""}) = "a,b," StringUtils.joinWith(",", {"a", null, "b"}) = "a,,b" StringUtils.joinWith(null, {"a", "b"}) = "ab"
separator
- the separator character to use, null treated as ""objects
- the varargs providing the values to join together. null
elements are treated as ""java.lang.IllegalArgumentException
- if a null varargs is providedpublic static java.lang.String deleteWhitespace(java.lang.String str)
Deletes all whitespaces from a String as defined by
Character.isWhitespace(char)
.
StringUtils.deleteWhitespace(null) = null StringUtils.deleteWhitespace("") = "" StringUtils.deleteWhitespace("abc") = "abc" StringUtils.deleteWhitespace(" ab c ") = "abc"
str
- the String to delete whitespace from, may be nullnull
if null String inputpublic static java.lang.String removeStart(java.lang.String str, java.lang.String remove)
Removes a substring only if it is at the beginning of a source string, otherwise returns the source string.
A null
source string will return null
.
An empty ("") source string will return the empty string.
A null
search string will return the source string.
StringUtils.removeStart(null, *) = null StringUtils.removeStart("", *) = "" StringUtils.removeStart(*, null) = * StringUtils.removeStart("www.domain.com", "www.") = "domain.com" StringUtils.removeStart("domain.com", "www.") = "domain.com" StringUtils.removeStart("www.domain.com", "domain") = "www.domain.com" StringUtils.removeStart("abc", "") = "abc"
str
- the source String to search, may be nullremove
- the String to search for and remove, may be nullnull
if null String inputpublic static java.lang.String removeStartIgnoreCase(java.lang.String str, java.lang.String remove)
Case insensitive removal of a substring if it is at the beginning of a source string, otherwise returns the source string.
A null
source string will return null
.
An empty ("") source string will return the empty string.
A null
search string will return the source string.
StringUtils.removeStartIgnoreCase(null, *) = null StringUtils.removeStartIgnoreCase("", *) = "" StringUtils.removeStartIgnoreCase(*, null) = * StringUtils.removeStartIgnoreCase("www.domain.com", "www.") = "domain.com" StringUtils.removeStartIgnoreCase("www.domain.com", "WWW.") = "domain.com" StringUtils.removeStartIgnoreCase("domain.com", "www.") = "domain.com" StringUtils.removeStartIgnoreCase("www.domain.com", "domain") = "www.domain.com" StringUtils.removeStartIgnoreCase("abc", "") = "abc"
str
- the source String to search, may be nullremove
- the String to search for (case insensitive) and remove, may be nullnull
if null String inputpublic static java.lang.String removeEnd(java.lang.String str, java.lang.String remove)
Removes a substring only if it is at the end of a source string, otherwise returns the source string.
A null
source string will return null
.
An empty ("") source string will return the empty string.
A null
search string will return the source string.
StringUtils.removeEnd(null, *) = null StringUtils.removeEnd("", *) = "" StringUtils.removeEnd(*, null) = * StringUtils.removeEnd("www.domain.com", ".com.") = "www.domain.com" StringUtils.removeEnd("www.domain.com", ".com") = "www.domain" StringUtils.removeEnd("www.domain.com", "domain") = "www.domain.com" StringUtils.removeEnd("abc", "") = "abc"
str
- the source String to search, may be nullremove
- the String to search for and remove, may be nullnull
if null String inputpublic static java.lang.String removeEndIgnoreCase(java.lang.String str, java.lang.String remove)
Case insensitive removal of a substring if it is at the end of a source string, otherwise returns the source string.
A null
source string will return null
.
An empty ("") source string will return the empty string.
A null
search string will return the source string.
StringUtils.removeEndIgnoreCase(null, *) = null StringUtils.removeEndIgnoreCase("", *) = "" StringUtils.removeEndIgnoreCase(*, null) = * StringUtils.removeEndIgnoreCase("www.domain.com", ".com.") = "www.domain.com" StringUtils.removeEndIgnoreCase("www.domain.com", ".com") = "www.domain" StringUtils.removeEndIgnoreCase("www.domain.com", "domain") = "www.domain.com" StringUtils.removeEndIgnoreCase("abc", "") = "abc" StringUtils.removeEndIgnoreCase("www.domain.com", ".COM") = "www.domain") StringUtils.removeEndIgnoreCase("www.domain.COM", ".com") = "www.domain")
str
- the source String to search, may be nullremove
- the String to search for (case insensitive) and remove, may be nullnull
if null String inputpublic static java.lang.String remove(java.lang.String str, java.lang.String remove)
Removes all occurrences of a substring from within the source string.
A null
source string will return null
.
An empty ("") source string will return the empty string.
A null
remove string will return the source string.
An empty ("") remove string will return the source string.
StringUtils.remove(null, *) = null StringUtils.remove("", *) = "" StringUtils.remove(*, null) = * StringUtils.remove(*, "") = * StringUtils.remove("queued", "ue") = "qd" StringUtils.remove("queued", "zz") = "queued"
str
- the source String to search, may be nullremove
- the String to search for and remove, may be nullnull
if null String inputpublic static java.lang.String removeIgnoreCase(java.lang.String str, java.lang.String remove)
Case insensitive removal of all occurrences of a substring from within the source string.
A null
source string will return null
. An empty ("")
source string will return the empty string. A null
remove string
will return the source string. An empty ("") remove string will return
the source string.
StringUtils.removeIgnoreCase(null, *) = null StringUtils.removeIgnoreCase("", *) = "" StringUtils.removeIgnoreCase(*, null) = * StringUtils.removeIgnoreCase(*, "") = * StringUtils.removeIgnoreCase("queued", "ue") = "qd" StringUtils.removeIgnoreCase("queued", "zz") = "queued" StringUtils.removeIgnoreCase("quEUed", "UE") = "qd" StringUtils.removeIgnoreCase("queued", "zZ") = "queued"
str
- the source String to search, may be nullremove
- the String to search for (case insensitive) and remove, may be
nullnull
if
null String inputpublic static java.lang.String remove(java.lang.String str, char remove)
Removes all occurrences of a character from within the source string.
A null
source string will return null
.
An empty ("") source string will return the empty string.
StringUtils.remove(null, *) = null StringUtils.remove("", *) = "" StringUtils.remove("queued", 'u') = "qeed" StringUtils.remove("queued", 'z') = "queued"
str
- the source String to search, may be nullremove
- the char to search for and remove, may be nullnull
if null String input@Deprecated public static java.lang.String removeAll(java.lang.String text, java.lang.String regex)
Removes each substring of the text String that matches the given regular expression.
This method is anull
safe equivalent to:
text.replaceAll(regex, StringUtils.EMPTY)
Pattern.compile(regex).matcher(text).replaceAll(StringUtils.EMPTY)
A null
reference passed to this method is a no-op.
Unlike in the removePattern(String, String)
method, the Pattern.DOTALL
option
is NOT automatically added.
To use the DOTALL option prepend "(?s)"
to the regex.
DOTALL is also known as single-line mode in Perl.
StringUtils.removeAll(null, *) = null StringUtils.removeAll("any", (String) null) = "any" StringUtils.removeAll("any", "") = "any" StringUtils.removeAll("any", ".*") = "" StringUtils.removeAll("any", ".+") = "" StringUtils.removeAll("abc", ".?") = "" StringUtils.removeAll("A<__>\n<__>B", "<.*>") = "A\nB" StringUtils.removeAll("A<__>\n<__>B", "(?s)<.*>") = "AB" StringUtils.removeAll("ABCabc123abc", "[a-z]") = "ABC123"
text
- text to remove from, may be nullregex
- the regular expression to which this string is to be matchednull
if null String inputjava.util.regex.PatternSyntaxException
- if the regular expression's syntax is invalidreplaceAll(String, String, String)
,
removePattern(String, String)
,
String.replaceAll(String, String)
,
Pattern
,
Pattern.DOTALL
@Deprecated public static java.lang.String removeFirst(java.lang.String text, java.lang.String regex)
Removes the first substring of the text string that matches the given regular expression.
This method is anull
safe equivalent to:
text.replaceFirst(regex, StringUtils.EMPTY)
Pattern.compile(regex).matcher(text).replaceFirst(StringUtils.EMPTY)
A null
reference passed to this method is a no-op.
The Pattern.DOTALL
option is NOT automatically added.
To use the DOTALL option prepend "(?s)"
to the regex.
DOTALL is also known as single-line mode in Perl.
StringUtils.removeFirst(null, *) = null StringUtils.removeFirst("any", (String) null) = "any" StringUtils.removeFirst("any", "") = "any" StringUtils.removeFirst("any", ".*") = "" StringUtils.removeFirst("any", ".+") = "" StringUtils.removeFirst("abc", ".?") = "bc" StringUtils.removeFirst("A<__>\n<__>B", "<.*>") = "A\n<__>B" StringUtils.removeFirst("A<__>\n<__>B", "(?s)<.*>") = "AB" StringUtils.removeFirst("ABCabc123", "[a-z]") = "ABCbc123" StringUtils.removeFirst("ABCabc123abc", "[a-z]+") = "ABC123abc"
text
- text to remove from, may be nullregex
- the regular expression to which this string is to be matchednull
if null String inputjava.util.regex.PatternSyntaxException
- if the regular expression's syntax is invalidreplaceFirst(String, String, String)
,
String.replaceFirst(String, String)
,
Pattern
,
Pattern.DOTALL
public static java.lang.String replaceOnce(java.lang.String text, java.lang.String searchString, java.lang.String replacement)
Replaces a String with another String inside a larger String, once.
A null
reference passed to this method is a no-op.
StringUtils.replaceOnce(null, *, *) = null StringUtils.replaceOnce("", *, *) = "" StringUtils.replaceOnce("any", null, *) = "any" StringUtils.replaceOnce("any", *, null) = "any" StringUtils.replaceOnce("any", "", *) = "any" StringUtils.replaceOnce("aba", "a", null) = "aba" StringUtils.replaceOnce("aba", "a", "") = "ba" StringUtils.replaceOnce("aba", "a", "z") = "zba"
text
- text to search and replace in, may be nullsearchString
- the String to search for, may be nullreplacement
- the String to replace with, may be nullnull
if null String inputreplace(String text, String searchString, String replacement, int max)
public static java.lang.String replaceOnceIgnoreCase(java.lang.String text, java.lang.String searchString, java.lang.String replacement)
Case insensitively replaces a String with another String inside a larger String, once.
A null
reference passed to this method is a no-op.
StringUtils.replaceOnceIgnoreCase(null, *, *) = null StringUtils.replaceOnceIgnoreCase("", *, *) = "" StringUtils.replaceOnceIgnoreCase("any", null, *) = "any" StringUtils.replaceOnceIgnoreCase("any", *, null) = "any" StringUtils.replaceOnceIgnoreCase("any", "", *) = "any" StringUtils.replaceOnceIgnoreCase("aba", "a", null) = "aba" StringUtils.replaceOnceIgnoreCase("aba", "a", "") = "ba" StringUtils.replaceOnceIgnoreCase("aba", "a", "z") = "zba" StringUtils.replaceOnceIgnoreCase("FoOFoofoo", "foo", "") = "Foofoo"
text
- text to search and replace in, may be nullsearchString
- the String to search for (case insensitive), may be nullreplacement
- the String to replace with, may be nullnull
if null String inputreplaceIgnoreCase(String text, String searchString, String replacement, int max)
@Deprecated public static java.lang.String replacePattern(java.lang.String source, java.lang.String regex, java.lang.String replacement)
Replaces each substring of the source String that matches the given regular expression with the given
replacement using the Pattern.DOTALL
option. DOTALL is also known as single-line mode in Perl.
null
safe equivalent to:
source.replaceAll("(?s)" + regex, replacement)
Pattern.compile(regex, Pattern.DOTALL).matcher(source).replaceAll(replacement)
A null
reference passed to this method is a no-op.
StringUtils.replacePattern(null, *, *) = null StringUtils.replacePattern("any", (String) null, *) = "any" StringUtils.replacePattern("any", *, null) = "any" StringUtils.replacePattern("", "", "zzz") = "zzz" StringUtils.replacePattern("", ".*", "zzz") = "zzz" StringUtils.replacePattern("", ".+", "zzz") = "" StringUtils.replacePattern("<__>\n<__>", "<.*>", "z") = "z" StringUtils.replacePattern("ABCabc123", "[a-z]", "_") = "ABC___123" StringUtils.replacePattern("ABCabc123", "[^A-Z0-9]+", "_") = "ABC_123" StringUtils.replacePattern("ABCabc123", "[^A-Z0-9]+", "") = "ABC123" StringUtils.replacePattern("Lorem ipsum dolor sit", "( +)([a-z]+)", "_$2") = "Lorem_ipsum_dolor_sit"
source
- the source stringregex
- the regular expression to which this string is to be matchedreplacement
- the string to be substituted for each matchString
null
reference passed to this method is a no-op.replaceAll(String, String, String)
,
String.replaceAll(String, String)
,
Pattern.DOTALL
@Deprecated public static java.lang.String removePattern(java.lang.String source, java.lang.String regex)
Removes each substring of the source String that matches the given regular expression using the DOTALL option.
This call is anull
safe equivalent to:
source.replaceAll("(?s)" + regex, StringUtils.EMPTY)
Pattern.compile(regex, Pattern.DOTALL).matcher(source).replaceAll(StringUtils.EMPTY)
A null
reference passed to this method is a no-op.
StringUtils.removePattern(null, *) = null StringUtils.removePattern("any", (String) null) = "any" StringUtils.removePattern("A<__>\n<__>B", "<.*>") = "AB" StringUtils.removePattern("ABCabc123", "[a-z]") = "ABC123"
source
- the source stringregex
- the regular expression to which this string is to be matchedString
null
reference passed to this method is a no-op.replacePattern(String, String, String)
,
String.replaceAll(String, String)
,
Pattern.DOTALL
@Deprecated public static java.lang.String replaceAll(java.lang.String text, java.lang.String regex, java.lang.String replacement)
Replaces each substring of the text String that matches the given regular expression with the given replacement.
This method is anull
safe equivalent to:
text.replaceAll(regex, replacement)
Pattern.compile(regex).matcher(text).replaceAll(replacement)
A null
reference passed to this method is a no-op.
Unlike in the replacePattern(String, String, String)
method, the Pattern.DOTALL
option
is NOT automatically added.
To use the DOTALL option prepend "(?s)"
to the regex.
DOTALL is also known as single-line mode in Perl.
StringUtils.replaceAll(null, *, *) = null StringUtils.replaceAll("any", (String) null, *) = "any" StringUtils.replaceAll("any", *, null) = "any" StringUtils.replaceAll("", "", "zzz") = "zzz" StringUtils.replaceAll("", ".*", "zzz") = "zzz" StringUtils.replaceAll("", ".+", "zzz") = "" StringUtils.replaceAll("abc", "", "ZZ") = "ZZaZZbZZcZZ" StringUtils.replaceAll("<__>\n<__>", "<.*>", "z") = "z\nz" StringUtils.replaceAll("<__>\n<__>", "(?s)<.*>", "z") = "z" StringUtils.replaceAll("ABCabc123", "[a-z]", "_") = "ABC___123" StringUtils.replaceAll("ABCabc123", "[^A-Z0-9]+", "_") = "ABC_123" StringUtils.replaceAll("ABCabc123", "[^A-Z0-9]+", "") = "ABC123" StringUtils.replaceAll("Lorem ipsum dolor sit", "( +)([a-z]+)", "_$2") = "Lorem_ipsum_dolor_sit"
text
- text to search and replace in, may be nullregex
- the regular expression to which this string is to be matchedreplacement
- the string to be substituted for each matchnull
if null String inputjava.util.regex.PatternSyntaxException
- if the regular expression's syntax is invalidreplacePattern(String, String, String)
,
String.replaceAll(String, String)
,
Pattern
,
Pattern.DOTALL
@Deprecated public static java.lang.String replaceFirst(java.lang.String text, java.lang.String regex, java.lang.String replacement)
Replaces the first substring of the text string that matches the given regular expression with the given replacement.
This method is anull
safe equivalent to:
text.replaceFirst(regex, replacement)
Pattern.compile(regex).matcher(text).replaceFirst(replacement)
A null
reference passed to this method is a no-op.
The Pattern.DOTALL
option is NOT automatically added.
To use the DOTALL option prepend "(?s)"
to the regex.
DOTALL is also known as single-line mode in Perl.
StringUtils.replaceFirst(null, *, *) = null StringUtils.replaceFirst("any", (String) null, *) = "any" StringUtils.replaceFirst("any", *, null) = "any" StringUtils.replaceFirst("", "", "zzz") = "zzz" StringUtils.replaceFirst("", ".*", "zzz") = "zzz" StringUtils.replaceFirst("", ".+", "zzz") = "" StringUtils.replaceFirst("abc", "", "ZZ") = "ZZabc" StringUtils.replaceFirst("<__>\n<__>", "<.*>", "z") = "z\n<__>" StringUtils.replaceFirst("<__>\n<__>", "(?s)<.*>", "z") = "z" StringUtils.replaceFirst("ABCabc123", "[a-z]", "_") = "ABC_bc123" StringUtils.replaceFirst("ABCabc123abc", "[^A-Z0-9]+", "_") = "ABC_123abc" StringUtils.replaceFirst("ABCabc123abc", "[^A-Z0-9]+", "") = "ABC123abc" StringUtils.replaceFirst("Lorem ipsum dolor sit", "( +)([a-z]+)", "_$2") = "Lorem_ipsum dolor sit"
text
- text to search and replace in, may be nullregex
- the regular expression to which this string is to be matchedreplacement
- the string to be substituted for the first matchnull
if null String inputjava.util.regex.PatternSyntaxException
- if the regular expression's syntax is invalidString.replaceFirst(String, String)
,
Pattern
,
Pattern.DOTALL
public static java.lang.String replace(java.lang.String text, java.lang.String searchString, java.lang.String replacement)
Replaces all occurrences of a String within another String.
A null
reference passed to this method is a no-op.
StringUtils.replace(null, *, *) = null StringUtils.replace("", *, *) = "" StringUtils.replace("any", null, *) = "any" StringUtils.replace("any", *, null) = "any" StringUtils.replace("any", "", *) = "any" StringUtils.replace("aba", "a", null) = "aba" StringUtils.replace("aba", "a", "") = "b" StringUtils.replace("aba", "a", "z") = "zbz"
text
- text to search and replace in, may be nullsearchString
- the String to search for, may be nullreplacement
- the String to replace it with, may be nullnull
if null String inputreplace(String text, String searchString, String replacement, int max)
public static java.lang.String replaceIgnoreCase(java.lang.String text, java.lang.String searchString, java.lang.String replacement)
Case insensitively replaces all occurrences of a String within another String.
A null
reference passed to this method is a no-op.
StringUtils.replaceIgnoreCase(null, *, *) = null StringUtils.replaceIgnoreCase("", *, *) = "" StringUtils.replaceIgnoreCase("any", null, *) = "any" StringUtils.replaceIgnoreCase("any", *, null) = "any" StringUtils.replaceIgnoreCase("any", "", *) = "any" StringUtils.replaceIgnoreCase("aba", "a", null) = "aba" StringUtils.replaceIgnoreCase("abA", "A", "") = "b" StringUtils.replaceIgnoreCase("aba", "A", "z") = "zbz"
text
- text to search and replace in, may be nullsearchString
- the String to search for (case insensitive), may be nullreplacement
- the String to replace it with, may be nullnull
if null String inputreplaceIgnoreCase(String text, String searchString, String replacement, int max)
public static java.lang.String replace(java.lang.String text, java.lang.String searchString, java.lang.String replacement, int max)
Replaces a String with another String inside a larger String,
for the first max
values of the search String.
A null
reference passed to this method is a no-op.
StringUtils.replace(null, *, *, *) = null StringUtils.replace("", *, *, *) = "" StringUtils.replace("any", null, *, *) = "any" StringUtils.replace("any", *, null, *) = "any" StringUtils.replace("any", "", *, *) = "any" StringUtils.replace("any", *, *, 0) = "any" StringUtils.replace("abaa", "a", null, -1) = "abaa" StringUtils.replace("abaa", "a", "", -1) = "b" StringUtils.replace("abaa", "a", "z", 0) = "abaa" StringUtils.replace("abaa", "a", "z", 1) = "zbaa" StringUtils.replace("abaa", "a", "z", 2) = "zbza" StringUtils.replace("abaa", "a", "z", -1) = "zbzz"
text
- text to search and replace in, may be nullsearchString
- the String to search for, may be nullreplacement
- the String to replace it with, may be nullmax
- maximum number of values to replace, or -1
if no maximumnull
if null String inputpublic static java.lang.String replaceIgnoreCase(java.lang.String text, java.lang.String searchString, java.lang.String replacement, int max)
Case insensitively replaces a String with another String inside a larger String,
for the first max
values of the search String.
A null
reference passed to this method is a no-op.
StringUtils.replaceIgnoreCase(null, *, *, *) = null StringUtils.replaceIgnoreCase("", *, *, *) = "" StringUtils.replaceIgnoreCase("any", null, *, *) = "any" StringUtils.replaceIgnoreCase("any", *, null, *) = "any" StringUtils.replaceIgnoreCase("any", "", *, *) = "any" StringUtils.replaceIgnoreCase("any", *, *, 0) = "any" StringUtils.replaceIgnoreCase("abaa", "a", null, -1) = "abaa" StringUtils.replaceIgnoreCase("abaa", "a", "", -1) = "b" StringUtils.replaceIgnoreCase("abaa", "a", "z", 0) = "abaa" StringUtils.replaceIgnoreCase("abaa", "A", "z", 1) = "zbaa" StringUtils.replaceIgnoreCase("abAa", "a", "z", 2) = "zbza" StringUtils.replaceIgnoreCase("abAa", "a", "z", -1) = "zbzz"
text
- text to search and replace in, may be nullsearchString
- the String to search for (case insensitive), may be nullreplacement
- the String to replace it with, may be nullmax
- maximum number of values to replace, or -1
if no maximumnull
if null String inputpublic static java.lang.String replaceEach(java.lang.String text, java.lang.String[] searchList, java.lang.String[] replacementList)
Replaces all occurrences of Strings within another String.
A null
reference passed to this method is a no-op, or if
any "search string" or "string to replace" is null, that replace will be
ignored. This will not repeat. For repeating replaces, call the
overloaded method.
StringUtils.replaceEach(null, *, *) = null StringUtils.replaceEach("", *, *) = "" StringUtils.replaceEach("aba", null, null) = "aba" StringUtils.replaceEach("aba", new String[0], null) = "aba" StringUtils.replaceEach("aba", null, new String[0]) = "aba" StringUtils.replaceEach("aba", new String[]{"a"}, null) = "aba" StringUtils.replaceEach("aba", new String[]{"a"}, new String[]{""}) = "b" StringUtils.replaceEach("aba", new String[]{null}, new String[]{"a"}) = "aba" StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"w", "t"}) = "wcte" (example of how it does not repeat) StringUtils.replaceEach("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"}) = "dcte"
text
- text to search and replace in, no-op if nullsearchList
- the Strings to search for, no-op if nullreplacementList
- the Strings to replace them with, no-op if nullnull
if
null String inputjava.lang.IllegalArgumentException
- if the lengths of the arrays are not the same (null is ok,
and/or size 0)public static java.lang.String replaceEachRepeatedly(java.lang.String text, java.lang.String[] searchList, java.lang.String[] replacementList)
Replaces all occurrences of Strings within another String.
A null
reference passed to this method is a no-op, or if
any "search string" or "string to replace" is null, that replace will be
ignored.
StringUtils.replaceEachRepeatedly(null, *, *) = null StringUtils.replaceEachRepeatedly("", *, *) = "" StringUtils.replaceEachRepeatedly("aba", null, null) = "aba" StringUtils.replaceEachRepeatedly("aba", new String[0], null) = "aba" StringUtils.replaceEachRepeatedly("aba", null, new String[0]) = "aba" StringUtils.replaceEachRepeatedly("aba", new String[]{"a"}, null) = "aba" StringUtils.replaceEachRepeatedly("aba", new String[]{"a"}, new String[]{""}) = "b" StringUtils.replaceEachRepeatedly("aba", new String[]{null}, new String[]{"a"}) = "aba" StringUtils.replaceEachRepeatedly("abcde", new String[]{"ab", "d"}, new String[]{"w", "t"}) = "wcte" (example of how it repeats) StringUtils.replaceEachRepeatedly("abcde", new String[]{"ab", "d"}, new String[]{"d", "t"}) = "tcte" StringUtils.replaceEachRepeatedly("abcde", new String[]{"ab", "d"}, new String[]{"d", "ab"}) = IllegalStateException
text
- text to search and replace in, no-op if nullsearchList
- the Strings to search for, no-op if nullreplacementList
- the Strings to replace them with, no-op if nullnull
if
null String inputjava.lang.IllegalStateException
- if the search is repeating and there is an endless loop due
to outputs of one being inputs to anotherjava.lang.IllegalArgumentException
- if the lengths of the arrays are not the same (null is ok,
and/or size 0)public static java.lang.String replaceChars(java.lang.String str, char searchChar, char replaceChar)
Replaces all occurrences of a character in a String with another.
This is a null-safe version of String.replace(char, char)
.
A null
string input returns null
.
An empty ("") string input returns an empty string.
StringUtils.replaceChars(null, *, *) = null StringUtils.replaceChars("", *, *) = "" StringUtils.replaceChars("abcba", 'b', 'y') = "aycya" StringUtils.replaceChars("abcba", 'z', 'y') = "abcba"
str
- String to replace characters in, may be nullsearchChar
- the character to search for, may be nullreplaceChar
- the character to replace, may be nullnull
if null string inputpublic static java.lang.String replaceChars(java.lang.String str, java.lang.String searchChars, java.lang.String replaceChars)
Replaces multiple characters in a String in one go. This method can also be used to delete characters.
For example:
replaceChars("hello", "ho", "jy") = jelly
.
A null
string input returns null
.
An empty ("") string input returns an empty string.
A null or empty set of search characters returns the input string.
The length of the search characters should normally equal the length of the replace characters. If the search characters is longer, then the extra search characters are deleted. If the search characters is shorter, then the extra replace characters are ignored.
StringUtils.replaceChars(null, *, *) = null StringUtils.replaceChars("", *, *) = "" StringUtils.replaceChars("abc", null, *) = "abc" StringUtils.replaceChars("abc", "", *) = "abc" StringUtils.replaceChars("abc", "b", null) = "ac" StringUtils.replaceChars("abc", "b", "") = "ac" StringUtils.replaceChars("abcba", "bc", "yz") = "ayzya" StringUtils.replaceChars("abcba", "bc", "y") = "ayya" StringUtils.replaceChars("abcba", "bc", "yzx") = "ayzya"
str
- String to replace characters in, may be nullsearchChars
- a set of characters to search for, may be nullreplaceChars
- a set of characters to replace, may be nullnull
if null string inputpublic static java.lang.String overlay(java.lang.String str, java.lang.String overlay, int start, int end)
Overlays part of a String with another String.
A null
string input returns null
.
A negative index is treated as zero.
An index greater than the string length is treated as the string length.
The start index is always the smaller of the two indices.
StringUtils.overlay(null, *, *, *) = null StringUtils.overlay("", "abc", 0, 0) = "abc" StringUtils.overlay("abcdef", null, 2, 4) = "abef" StringUtils.overlay("abcdef", "", 2, 4) = "abef" StringUtils.overlay("abcdef", "", 4, 2) = "abef" StringUtils.overlay("abcdef", "zzzz", 2, 4) = "abzzzzef" StringUtils.overlay("abcdef", "zzzz", 4, 2) = "abzzzzef" StringUtils.overlay("abcdef", "zzzz", -1, 4) = "zzzzef" StringUtils.overlay("abcdef", "zzzz", 2, 8) = "abzzzz" StringUtils.overlay("abcdef", "zzzz", -2, -3) = "zzzzabcdef" StringUtils.overlay("abcdef", "zzzz", 8, 10) = "abcdefzzzz"
str
- the String to do overlaying in, may be nulloverlay
- the String to overlay, may be nullstart
- the position to start overlaying atend
- the position to stop overlaying beforenull
if null String inputpublic static java.lang.String chomp(java.lang.String str)
Removes one newline from end of a String if it's there,
otherwise leave it alone. A newline is "\n
",
"\r
", or "\r\n
".
NOTE: This method changed in 2.0. It now more closely matches Perl chomp.
StringUtils.chomp(null) = null StringUtils.chomp("") = "" StringUtils.chomp("abc \r") = "abc " StringUtils.chomp("abc\n") = "abc" StringUtils.chomp("abc\r\n") = "abc" StringUtils.chomp("abc\r\n\r\n") = "abc\r\n" StringUtils.chomp("abc\n\r") = "abc\n" StringUtils.chomp("abc\n\rabc") = "abc\n\rabc" StringUtils.chomp("\r") = "" StringUtils.chomp("\n") = "" StringUtils.chomp("\r\n") = ""
str
- the String to chomp a newline from, may be nullnull
if null String input@Deprecated public static java.lang.String chomp(java.lang.String str, java.lang.String separator)
removeEnd(String, String)
insteadRemoves separator
from the end of
str
if it's there, otherwise leave it alone.
NOTE: This method changed in version 2.0.
It now more closely matches Perl chomp.
For the previous behavior, use substringBeforeLast(String, String)
.
This method uses String.endsWith(String)
.
StringUtils.chomp(null, *) = null StringUtils.chomp("", *) = "" StringUtils.chomp("foobar", "bar") = "foo" StringUtils.chomp("foobar", "baz") = "foobar" StringUtils.chomp("foo", "foo") = "" StringUtils.chomp("foo ", "foo") = "foo " StringUtils.chomp(" foo", "foo") = " " StringUtils.chomp("foo", "foooo") = "foo" StringUtils.chomp("foo", "") = "foo" StringUtils.chomp("foo", null) = "foo"
str
- the String to chomp from, may be nullseparator
- separator String, may be nullnull
if null String inputpublic static java.lang.String chop(java.lang.String str)
Remove the last character from a String.
If the String ends in \r\n
, then remove both
of them.
StringUtils.chop(null) = null StringUtils.chop("") = "" StringUtils.chop("abc \r") = "abc " StringUtils.chop("abc\n") = "abc" StringUtils.chop("abc\r\n") = "abc" StringUtils.chop("abc") = "ab" StringUtils.chop("abc\nabc") = "abc\nab" StringUtils.chop("a") = "" StringUtils.chop("\r") = "" StringUtils.chop("\n") = "" StringUtils.chop("\r\n") = ""
str
- the String to chop last character from, may be nullnull
if null String inputpublic static java.lang.String repeat(java.lang.String str, int repeat)
Repeat a String repeat
times to form a
new String.
StringUtils.repeat(null, 2) = null StringUtils.repeat("", 0) = "" StringUtils.repeat("", 2) = "" StringUtils.repeat("a", 3) = "aaa" StringUtils.repeat("ab", 2) = "abab" StringUtils.repeat("a", -2) = ""
str
- the String to repeat, may be nullrepeat
- number of times to repeat str, negative treated as zeronull
if null String inputpublic static java.lang.String repeat(java.lang.String str, java.lang.String separator, int repeat)
Repeat a String repeat
times to form a
new String, with a String separator injected each time.
StringUtils.repeat(null, null, 2) = null StringUtils.repeat(null, "x", 2) = null StringUtils.repeat("", null, 0) = "" StringUtils.repeat("", "", 2) = "" StringUtils.repeat("", "x", 3) = "xxx" StringUtils.repeat("?", ", ", 3) = "?, ?, ?"
str
- the String to repeat, may be nullseparator
- the String to inject, may be nullrepeat
- number of times to repeat str, negative treated as zeronull
if null String inputpublic static java.lang.String repeat(char ch, int repeat)
Returns padding using the specified delimiter repeated to a given length.
StringUtils.repeat('e', 0) = "" StringUtils.repeat('e', 3) = "eee" StringUtils.repeat('e', -2) = ""
Note: this method does not support padding with
Unicode Supplementary Characters
as they require a pair of char
s to be represented.
If you are needing to support full I18N of your applications
consider using repeat(String, int)
instead.
ch
- character to repeatrepeat
- number of times to repeat char, negative treated as zerorepeat(String, int)
public static java.lang.String rightPad(java.lang.String str, int size)
Right pad a String with spaces (' ').
The String is padded to the size of size
.
StringUtils.rightPad(null, *) = null StringUtils.rightPad("", 3) = " " StringUtils.rightPad("bat", 3) = "bat" StringUtils.rightPad("bat", 5) = "bat " StringUtils.rightPad("bat", 1) = "bat" StringUtils.rightPad("bat", -1) = "bat"
str
- the String to pad out, may be nullsize
- the size to pad tonull
if null String inputpublic static java.lang.String rightPad(java.lang.String str, int size, char padChar)
Right pad a String with a specified character.
The String is padded to the size of size
.
StringUtils.rightPad(null, *, *) = null StringUtils.rightPad("", 3, 'z') = "zzz" StringUtils.rightPad("bat", 3, 'z') = "bat" StringUtils.rightPad("bat", 5, 'z') = "batzz" StringUtils.rightPad("bat", 1, 'z') = "bat" StringUtils.rightPad("bat", -1, 'z') = "bat"
str
- the String to pad out, may be nullsize
- the size to pad topadChar
- the character to pad withnull
if null String inputpublic static java.lang.String rightPad(java.lang.String str, int size, java.lang.String padStr)
Right pad a String with a specified String.
The String is padded to the size of size
.
StringUtils.rightPad(null, *, *) = null StringUtils.rightPad("", 3, "z") = "zzz" StringUtils.rightPad("bat", 3, "yz") = "bat" StringUtils.rightPad("bat", 5, "yz") = "batyz" StringUtils.rightPad("bat", 8, "yz") = "batyzyzy" StringUtils.rightPad("bat", 1, "yz") = "bat" StringUtils.rightPad("bat", -1, "yz") = "bat" StringUtils.rightPad("bat", 5, null) = "bat " StringUtils.rightPad("bat", 5, "") = "bat "
str
- the String to pad out, may be nullsize
- the size to pad topadStr
- the String to pad with, null or empty treated as single spacenull
if null String inputpublic static java.lang.String leftPad(java.lang.String str, int size)
Left pad a String with spaces (' ').
The String is padded to the size of size
.
StringUtils.leftPad(null, *) = null StringUtils.leftPad("", 3) = " " StringUtils.leftPad("bat", 3) = "bat" StringUtils.leftPad("bat", 5) = " bat" StringUtils.leftPad("bat", 1) = "bat" StringUtils.leftPad("bat", -1) = "bat"
str
- the String to pad out, may be nullsize
- the size to pad tonull
if null String inputpublic static java.lang.String leftPad(java.lang.String str, int size, char padChar)
Left pad a String with a specified character.
Pad to a size of size
.
StringUtils.leftPad(null, *, *) = null StringUtils.leftPad("", 3, 'z') = "zzz" StringUtils.leftPad("bat", 3, 'z') = "bat" StringUtils.leftPad("bat", 5, 'z') = "zzbat" StringUtils.leftPad("bat", 1, 'z') = "bat" StringUtils.leftPad("bat", -1, 'z') = "bat"
str
- the String to pad out, may be nullsize
- the size to pad topadChar
- the character to pad withnull
if null String inputpublic static java.lang.String leftPad(java.lang.String str, int size, java.lang.String padStr)
Left pad a String with a specified String.
Pad to a size of size
.
StringUtils.leftPad(null, *, *) = null StringUtils.leftPad("", 3, "z") = "zzz" StringUtils.leftPad("bat", 3, "yz") = "bat" StringUtils.leftPad("bat", 5, "yz") = "yzbat" StringUtils.leftPad("bat", 8, "yz") = "yzyzybat" StringUtils.leftPad("bat", 1, "yz") = "bat" StringUtils.leftPad("bat", -1, "yz") = "bat" StringUtils.leftPad("bat", 5, null) = " bat" StringUtils.leftPad("bat", 5, "") = " bat"
str
- the String to pad out, may be nullsize
- the size to pad topadStr
- the String to pad with, null or empty treated as single spacenull
if null String inputpublic static int length(java.lang.CharSequence cs)
0
if the CharSequence is
null
.cs
- a CharSequence or null
0
if the CharSequence is
null
.public static java.lang.String center(java.lang.String str, int size)
Centers a String in a larger String of size size
using the space character (' ').
If the size is less than the String length, the String is returned.
A null
String returns null
.
A negative size is treated as zero.
Equivalent to center(str, size, " ")
.
StringUtils.center(null, *) = null StringUtils.center("", 4) = " " StringUtils.center("ab", -1) = "ab" StringUtils.center("ab", 4) = " ab " StringUtils.center("abcd", 2) = "abcd" StringUtils.center("a", 4) = " a "
str
- the String to center, may be nullsize
- the int size of new String, negative treated as zeronull
if null String inputpublic static java.lang.String center(java.lang.String str, int size, char padChar)
Centers a String in a larger String of size size
.
Uses a supplied character as the value to pad the String with.
If the size is less than the String length, the String is returned.
A null
String returns null
.
A negative size is treated as zero.
StringUtils.center(null, *, *) = null StringUtils.center("", 4, ' ') = " " StringUtils.center("ab", -1, ' ') = "ab" StringUtils.center("ab", 4, ' ') = " ab " StringUtils.center("abcd", 2, ' ') = "abcd" StringUtils.center("a", 4, ' ') = " a " StringUtils.center("a", 4, 'y') = "yayy"
str
- the String to center, may be nullsize
- the int size of new String, negative treated as zeropadChar
- the character to pad the new String withnull
if null String inputpublic static java.lang.String center(java.lang.String str, int size, java.lang.String padStr)
Centers a String in a larger String of size size
.
Uses a supplied String as the value to pad the String with.
If the size is less than the String length, the String is returned.
A null
String returns null
.
A negative size is treated as zero.
StringUtils.center(null, *, *) = null StringUtils.center("", 4, " ") = " " StringUtils.center("ab", -1, " ") = "ab" StringUtils.center("ab", 4, " ") = " ab " StringUtils.center("abcd", 2, " ") = "abcd" StringUtils.center("a", 4, " ") = " a " StringUtils.center("a", 4, "yz") = "yayz" StringUtils.center("abc", 7, null) = " abc " StringUtils.center("abc", 7, "") = " abc "
str
- the String to center, may be nullsize
- the int size of new String, negative treated as zeropadStr
- the String to pad the new String with, must not be null or emptynull
if null String inputjava.lang.IllegalArgumentException
- if padStr is null
or emptypublic static java.lang.String upperCase(java.lang.String str)
Converts a String to upper case as per String.toUpperCase()
.
A null
input String returns null
.
StringUtils.upperCase(null) = null StringUtils.upperCase("") = "" StringUtils.upperCase("aBc") = "ABC"
Note: As described in the documentation for String.toUpperCase()
,
the result of this method is affected by the current locale.
For platform-independent case transformations, the method lowerCase(String, Locale)
should be used with a specific locale (e.g. Locale.ENGLISH
).
str
- the String to upper case, may be nullnull
if null String inputpublic static java.lang.String upperCase(java.lang.String str, java.util.Locale locale)
Converts a String to upper case as per String.toUpperCase(Locale)
.
A null
input String returns null
.
StringUtils.upperCase(null, Locale.ENGLISH) = null StringUtils.upperCase("", Locale.ENGLISH) = "" StringUtils.upperCase("aBc", Locale.ENGLISH) = "ABC"
str
- the String to upper case, may be nulllocale
- the locale that defines the case transformation rules, must not be nullnull
if null String inputpublic static java.lang.String lowerCase(java.lang.String str)
Converts a String to lower case as per String.toLowerCase()
.
A null
input String returns null
.
StringUtils.lowerCase(null) = null StringUtils.lowerCase("") = "" StringUtils.lowerCase("aBc") = "abc"
Note: As described in the documentation for String.toLowerCase()
,
the result of this method is affected by the current locale.
For platform-independent case transformations, the method lowerCase(String, Locale)
should be used with a specific locale (e.g. Locale.ENGLISH
).
str
- the String to lower case, may be nullnull
if null String inputpublic static java.lang.String lowerCase(java.lang.String str, java.util.Locale locale)
Converts a String to lower case as per String.toLowerCase(Locale)
.
A null
input String returns null
.
StringUtils.lowerCase(null, Locale.ENGLISH) = null StringUtils.lowerCase("", Locale.ENGLISH) = "" StringUtils.lowerCase("aBc", Locale.ENGLISH) = "abc"
str
- the String to lower case, may be nulllocale
- the locale that defines the case transformation rules, must not be nullnull
if null String inputpublic static java.lang.String capitalize(java.lang.String str)
Capitalizes a String changing the first character to title case as
per Character.toTitleCase(int)
. No other characters are changed.
For a word based algorithm, see WordUtils.capitalize(String)
.
A null
input String returns null
.
StringUtils.capitalize(null) = null StringUtils.capitalize("") = "" StringUtils.capitalize("cat") = "Cat" StringUtils.capitalize("cAt") = "CAt" StringUtils.capitalize("'cat'") = "'cat'"
str
- the String to capitalize, may be nullnull
if null String inputWordUtils.capitalize(String)
,
uncapitalize(String)
public static java.lang.String uncapitalize(java.lang.String str)
Uncapitalizes a String, changing the first character to lower case as
per Character.toLowerCase(int)
. No other characters are changed.
For a word based algorithm, see WordUtils.uncapitalize(String)
.
A null
input String returns null
.
StringUtils.uncapitalize(null) = null StringUtils.uncapitalize("") = "" StringUtils.uncapitalize("cat") = "cat" StringUtils.uncapitalize("Cat") = "cat" StringUtils.uncapitalize("CAT") = "cAT"
str
- the String to uncapitalize, may be nullnull
if null String inputWordUtils.uncapitalize(String)
,
capitalize(String)
public static java.lang.String swapCase(java.lang.String str)
Swaps the case of a String changing upper and title case to lower case, and lower case to upper case.
For a word based algorithm, see WordUtils.swapCase(String)
.
A null
input String returns null
.
StringUtils.swapCase(null) = null StringUtils.swapCase("") = "" StringUtils.swapCase("The dog has a BONE") = "tHE DOG HAS A bone"
NOTE: This method changed in Lang version 2.0. It no longer performs a word based algorithm. If you only use ASCII, you will notice no change. That functionality is available in org.apache.commons.lang3.text.WordUtils.
str
- the String to swap case, may be nullnull
if null String inputpublic static int countMatches(java.lang.CharSequence str, java.lang.CharSequence sub)
Counts how many times the substring appears in the larger string.
A null
or empty ("") String input returns 0
.
StringUtils.countMatches(null, *) = 0 StringUtils.countMatches("", *) = 0 StringUtils.countMatches("abba", null) = 0 StringUtils.countMatches("abba", "") = 0 StringUtils.countMatches("abba", "a") = 2 StringUtils.countMatches("abba", "ab") = 1 StringUtils.countMatches("abba", "xxx") = 0
str
- the CharSequence to check, may be nullsub
- the substring to count, may be nullnull
public static int countMatches(java.lang.CharSequence str, char ch)
Counts how many times the char appears in the given string.
A null
or empty ("") String input returns 0
.
StringUtils.countMatches(null, *) = 0 StringUtils.countMatches("", *) = 0 StringUtils.countMatches("abba", 0) = 0 StringUtils.countMatches("abba", 'a') = 2 StringUtils.countMatches("abba", 'b') = 2 StringUtils.countMatches("abba", 'x') = 0
str
- the CharSequence to check, may be nullch
- the char to countnull
public static boolean isAlpha(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters.
null
will return false
.
An empty CharSequence (length()=0) will return false
.
StringUtils.isAlpha(null) = false StringUtils.isAlpha("") = false StringUtils.isAlpha(" ") = false StringUtils.isAlpha("abc") = true StringUtils.isAlpha("ab2c") = false StringUtils.isAlpha("ab-c") = false
cs
- the CharSequence to check, may be nulltrue
if only contains letters, and is non-nullpublic static boolean isAlphaSpace(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters and space (' ').
null
will return false
An empty CharSequence (length()=0) will return true
.
StringUtils.isAlphaSpace(null) = false StringUtils.isAlphaSpace("") = true StringUtils.isAlphaSpace(" ") = true StringUtils.isAlphaSpace("abc") = true StringUtils.isAlphaSpace("ab c") = true StringUtils.isAlphaSpace("ab2c") = false StringUtils.isAlphaSpace("ab-c") = false
cs
- the CharSequence to check, may be nulltrue
if only contains letters and space,
and is non-nullpublic static boolean isAlphanumeric(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters or digits.
null
will return false
.
An empty CharSequence (length()=0) will return false
.
StringUtils.isAlphanumeric(null) = false StringUtils.isAlphanumeric("") = false StringUtils.isAlphanumeric(" ") = false StringUtils.isAlphanumeric("abc") = true StringUtils.isAlphanumeric("ab c") = false StringUtils.isAlphanumeric("ab2c") = true StringUtils.isAlphanumeric("ab-c") = false
cs
- the CharSequence to check, may be nulltrue
if only contains letters or digits,
and is non-nullpublic static boolean isAlphanumericSpace(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode letters, digits
or space (' '
).
null
will return false
.
An empty CharSequence (length()=0) will return true
.
StringUtils.isAlphanumericSpace(null) = false StringUtils.isAlphanumericSpace("") = true StringUtils.isAlphanumericSpace(" ") = true StringUtils.isAlphanumericSpace("abc") = true StringUtils.isAlphanumericSpace("ab c") = true StringUtils.isAlphanumericSpace("ab2c") = true StringUtils.isAlphanumericSpace("ab-c") = false
cs
- the CharSequence to check, may be nulltrue
if only contains letters, digits or space,
and is non-nullpublic static boolean isAsciiPrintable(java.lang.CharSequence cs)
Checks if the CharSequence contains only ASCII printable characters.
null
will return false
.
An empty CharSequence (length()=0) will return true
.
StringUtils.isAsciiPrintable(null) = false StringUtils.isAsciiPrintable("") = true StringUtils.isAsciiPrintable(" ") = true StringUtils.isAsciiPrintable("Ceki") = true StringUtils.isAsciiPrintable("ab2c") = true StringUtils.isAsciiPrintable("!ab-c~") = true StringUtils.isAsciiPrintable(" ") = true StringUtils.isAsciiPrintable("!") = true StringUtils.isAsciiPrintable("~") = true StringUtils.isAsciiPrintable("") = false StringUtils.isAsciiPrintable("Ceki Gülcü") = false
cs
- the CharSequence to check, may be nulltrue
if every character is in the range
32 thru 126public static boolean isNumeric(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode digits. A decimal point is not a Unicode digit and returns false.
null
will return false
.
An empty CharSequence (length()=0) will return false
.
Note that the method does not allow for a leading sign, either positive or negative. Also, if a String passes the numeric test, it may still generate a NumberFormatException when parsed by Integer.parseInt or Long.parseLong, e.g. if the value is outside the range for int or long respectively.
StringUtils.isNumeric(null) = false StringUtils.isNumeric("") = false StringUtils.isNumeric(" ") = false StringUtils.isNumeric("123") = true StringUtils.isNumeric("१२३") = true StringUtils.isNumeric("12 3") = false StringUtils.isNumeric("ab2c") = false StringUtils.isNumeric("12-3") = false StringUtils.isNumeric("12.3") = false StringUtils.isNumeric("-123") = false StringUtils.isNumeric("+123") = false
cs
- the CharSequence to check, may be nulltrue
if only contains digits, and is non-nullpublic static boolean isNumericSpace(java.lang.CharSequence cs)
Checks if the CharSequence contains only Unicode digits or space
(' '
).
A decimal point is not a Unicode digit and returns false.
null
will return false
.
An empty CharSequence (length()=0) will return true
.
StringUtils.isNumericSpace(null) = false StringUtils.isNumericSpace("") = true StringUtils.isNumericSpace(" ") = true StringUtils.isNumericSpace("123") = true StringUtils.isNumericSpace("12 3") = true StringUtils.isNumeric("१२३") = true StringUtils.isNumeric("१२ ३") = true StringUtils.isNumericSpace("ab2c") = false StringUtils.isNumericSpace("12-3") = false StringUtils.isNumericSpace("12.3") = false
cs
- the CharSequence to check, may be nulltrue
if only contains digits or space,
and is non-nullpublic static java.lang.String getDigits(java.lang.String str)
Checks if a String str
contains Unicode digits,
if yes then concatenate all the digits in str
and return it as a String.
An empty ("") String will be returned if no digits found in str
.
StringUtils.getDigits(null) = null StringUtils.getDigits("") = "" StringUtils.getDigits("abc") = "" StringUtils.getDigits("1000$") = "1000" StringUtils.getDigits("1123~45") = "112345" StringUtils.getDigits("(541) 754-3010") = "5417543010" StringUtils.getDigits("१२३") = "१२३"
str
- the String to extract digits from, may be nullnull
String if str
is nullpublic static boolean isWhitespace(java.lang.CharSequence cs)
Checks if the CharSequence contains only whitespace.
Whitespace is defined by Character.isWhitespace(char)
.
null
will return false
.
An empty CharSequence (length()=0) will return true
.
StringUtils.isWhitespace(null) = false StringUtils.isWhitespace("") = true StringUtils.isWhitespace(" ") = true StringUtils.isWhitespace("abc") = false StringUtils.isWhitespace("ab2c") = false StringUtils.isWhitespace("ab-c") = false
cs
- the CharSequence to check, may be nulltrue
if only contains whitespace, and is non-nullpublic static boolean isAllLowerCase(java.lang.CharSequence cs)
Checks if the CharSequence contains only lowercase characters.
null
will return false
.
An empty CharSequence (length()=0) will return false
.
StringUtils.isAllLowerCase(null) = false StringUtils.isAllLowerCase("") = false StringUtils.isAllLowerCase(" ") = false StringUtils.isAllLowerCase("abc") = true StringUtils.isAllLowerCase("abC") = false StringUtils.isAllLowerCase("ab c") = false StringUtils.isAllLowerCase("ab1c") = false StringUtils.isAllLowerCase("ab/c") = false
cs
- the CharSequence to check, may be nulltrue
if only contains lowercase characters, and is non-nullpublic static boolean isAllUpperCase(java.lang.CharSequence cs)
Checks if the CharSequence contains only uppercase characters.
null
will return false
.
An empty String (length()=0) will return false
.
StringUtils.isAllUpperCase(null) = false StringUtils.isAllUpperCase("") = false StringUtils.isAllUpperCase(" ") = false StringUtils.isAllUpperCase("ABC") = true StringUtils.isAllUpperCase("aBC") = false StringUtils.isAllUpperCase("A C") = false StringUtils.isAllUpperCase("A1C") = false StringUtils.isAllUpperCase("A/C") = false
cs
- the CharSequence to check, may be nulltrue
if only contains uppercase characters, and is non-nullpublic static boolean isMixedCase(java.lang.CharSequence cs)
Checks if the CharSequence contains mixed casing of both uppercase and lowercase characters.
null
will return false
. An empty CharSequence (length()=0
) will return
false
.
StringUtils.isMixedCase(null) = false StringUtils.isMixedCase("") = false StringUtils.isMixedCase("ABC") = false StringUtils.isMixedCase("abc") = false StringUtils.isMixedCase("aBc") = true StringUtils.isMixedCase("A c") = true StringUtils.isMixedCase("A1c") = true StringUtils.isMixedCase("a/C") = true StringUtils.isMixedCase("aC\t") = true
cs
- the CharSequence to check, may be nulltrue
if the CharSequence contains both uppercase and lowercase characterspublic static java.lang.String defaultString(java.lang.String str)
Returns either the passed in String,
or if the String is null
, an empty String ("").
StringUtils.defaultString(null) = "" StringUtils.defaultString("") = "" StringUtils.defaultString("bat") = "bat"
str
- the String to check, may be nullnull
ObjectUtils.toString(Object)
,
String.valueOf(Object)
public static java.lang.String defaultString(java.lang.String str, java.lang.String defaultStr)
Returns either the passed in String, or if the String is
null
, the value of defaultStr
.
StringUtils.defaultString(null, "NULL") = "NULL" StringUtils.defaultString("", "NULL") = "" StringUtils.defaultString("bat", "NULL") = "bat"
str
- the String to check, may be nulldefaultStr
- the default String to return
if the input is null
, may be nullnull
ObjectUtils.toString(Object,String)
,
String.valueOf(Object)
@SafeVarargs public static <T extends java.lang.CharSequence> T firstNonBlank(T... values)
Returns the first value in the array which is not empty (""),
null
or whitespace only.
Whitespace is defined by Character.isWhitespace(char)
.
If all values are blank or the array is null
or empty then null
is returned.
StringUtils.firstNonBlank(null, null, null) = null StringUtils.firstNonBlank(null, "", " ") = null StringUtils.firstNonBlank("abc") = "abc" StringUtils.firstNonBlank(null, "xyz") = "xyz" StringUtils.firstNonBlank(null, "", " ", "xyz") = "xyz" StringUtils.firstNonBlank(null, "xyz", "abc") = "xyz" StringUtils.firstNonBlank() = null
T
- the specific kind of CharSequencevalues
- the values to test, may be null
or emptyvalues
which is not blank,
or null
if there are no non-blank values@SafeVarargs public static <T extends java.lang.CharSequence> T firstNonEmpty(T... values)
Returns the first value in the array which is not empty.
If all values are empty or the array is null
or empty then null
is returned.
StringUtils.firstNonEmpty(null, null, null) = null StringUtils.firstNonEmpty(null, null, "") = null StringUtils.firstNonEmpty(null, "", " ") = " " StringUtils.firstNonEmpty("abc") = "abc" StringUtils.firstNonEmpty(null, "xyz") = "xyz" StringUtils.firstNonEmpty("", "xyz") = "xyz" StringUtils.firstNonEmpty(null, "xyz", "abc") = "xyz" StringUtils.firstNonEmpty() = null
T
- the specific kind of CharSequencevalues
- the values to test, may be null
or emptyvalues
which is not empty,
or null
if there are no non-empty valuespublic static <T extends java.lang.CharSequence> T defaultIfBlank(T str, T defaultStr)
Returns either the passed in CharSequence, or if the CharSequence is
whitespace, empty ("") or null
, the value of defaultStr
.
Whitespace is defined by Character.isWhitespace(char)
.
StringUtils.defaultIfBlank(null, "NULL") = "NULL" StringUtils.defaultIfBlank("", "NULL") = "NULL" StringUtils.defaultIfBlank(" ", "NULL") = "NULL" StringUtils.defaultIfBlank("bat", "NULL") = "bat" StringUtils.defaultIfBlank("", null) = null
T
- the specific kind of CharSequencestr
- the CharSequence to check, may be nulldefaultStr
- the default CharSequence to return
if the input is whitespace, empty ("") or null
, may be nulldefaultString(String, String)
public static <T extends java.lang.CharSequence> T defaultIfEmpty(T str, T defaultStr)
Returns either the passed in CharSequence, or if the CharSequence is
empty or null
, the value of defaultStr
.
StringUtils.defaultIfEmpty(null, "NULL") = "NULL" StringUtils.defaultIfEmpty("", "NULL") = "NULL" StringUtils.defaultIfEmpty(" ", "NULL") = " " StringUtils.defaultIfEmpty("bat", "NULL") = "bat" StringUtils.defaultIfEmpty("", null) = null
T
- the specific kind of CharSequencestr
- the CharSequence to check, may be nulldefaultStr
- the default CharSequence to return
if the input is empty ("") or null
, may be nulldefaultString(String, String)
public static java.lang.String rotate(java.lang.String str, int shift)
Rotate (circular shift) a String of shift
characters.
shift > 0
, right circular shift (ex : ABCDEF => FABCDE)shift < 0
, left circular shift (ex : ABCDEF => BCDEFA)StringUtils.rotate(null, *) = null StringUtils.rotate("", *) = "" StringUtils.rotate("abcdefg", 0) = "abcdefg" StringUtils.rotate("abcdefg", 2) = "fgabcde" StringUtils.rotate("abcdefg", -2) = "cdefgab" StringUtils.rotate("abcdefg", 7) = "abcdefg" StringUtils.rotate("abcdefg", -7) = "abcdefg" StringUtils.rotate("abcdefg", 9) = "fgabcde" StringUtils.rotate("abcdefg", -9) = "cdefgab"
str
- the String to rotate, may be nullshift
- number of time to shift (positive : right shift, negative : left shift)shift == 0
,
or null
if null String inputpublic static java.lang.String reverse(java.lang.String str)
Reverses a String as per StringBuilder.reverse()
.
A null
String returns null
.
StringUtils.reverse(null) = null StringUtils.reverse("") = "" StringUtils.reverse("bat") = "tab"
str
- the String to reverse, may be nullnull
if null String inputpublic static java.lang.String reverseDelimited(java.lang.String str, char separatorChar)
Reverses a String that is delimited by a specific character.
The Strings between the delimiters are not reversed.
Thus java.lang.String becomes String.lang.java (if the delimiter
is '.'
).
StringUtils.reverseDelimited(null, *) = null StringUtils.reverseDelimited("", *) = "" StringUtils.reverseDelimited("a.b.c", 'x') = "a.b.c" StringUtils.reverseDelimited("a.b.c", ".") = "c.b.a"
str
- the String to reverse, may be nullseparatorChar
- the separator character to usenull
if null String inputpublic static java.lang.String abbreviate(java.lang.String str, int maxWidth)
Abbreviates a String using ellipses. This will turn "Now is the time for all good men" into "Now is the time for..."
Specifically:
str
is less than or equal to
maxWidth
, return str
.(substring(str, 0, max-3) + "...")
.maxWidth
is less than 4
, throw an
IllegalArgumentException
.maxWidth
.StringUtils.abbreviate(null, *) = null StringUtils.abbreviate("", 4) = "" StringUtils.abbreviate("abcdefg", 6) = "abc..." StringUtils.abbreviate("abcdefg", 7) = "abcdefg" StringUtils.abbreviate("abcdefg", 8) = "abcdefg" StringUtils.abbreviate("abcdefg", 4) = "a..." StringUtils.abbreviate("abcdefg", 3) = IllegalArgumentException
str
- the String to check, may be nullmaxWidth
- maximum length of result String, must be at least 4null
if null String inputjava.lang.IllegalArgumentException
- if the width is too smallpublic static java.lang.String abbreviate(java.lang.String str, int offset, int maxWidth)
Abbreviates a String using ellipses. This will turn "Now is the time for all good men" into "...is the time for..."
Works like abbreviate(String, int)
, but allows you to specify
a "left edge" offset. Note that this left edge is not necessarily going to
be the leftmost character in the result, or the first character following the
ellipses, but it will appear somewhere in the result.
In no case will it return a String of length greater than
maxWidth
.
StringUtils.abbreviate(null, *, *) = null StringUtils.abbreviate("", 0, 4) = "" StringUtils.abbreviate("abcdefghijklmno", -1, 10) = "abcdefg..." StringUtils.abbreviate("abcdefghijklmno", 0, 10) = "abcdefg..." StringUtils.abbreviate("abcdefghijklmno", 1, 10) = "abcdefg..." StringUtils.abbreviate("abcdefghijklmno", 4, 10) = "abcdefg..." StringUtils.abbreviate("abcdefghijklmno", 5, 10) = "...fghi..." StringUtils.abbreviate("abcdefghijklmno", 6, 10) = "...ghij..." StringUtils.abbreviate("abcdefghijklmno", 8, 10) = "...ijklmno" StringUtils.abbreviate("abcdefghijklmno", 10, 10) = "...ijklmno" StringUtils.abbreviate("abcdefghijklmno", 12, 10) = "...ijklmno" StringUtils.abbreviate("abcdefghij", 0, 3) = IllegalArgumentException StringUtils.abbreviate("abcdefghij", 5, 6) = IllegalArgumentException
str
- the String to check, may be nulloffset
- left edge of source StringmaxWidth
- maximum length of result String, must be at least 4null
if null String inputjava.lang.IllegalArgumentException
- if the width is too smallpublic static java.lang.String abbreviate(java.lang.String str, java.lang.String abbrevMarker, int maxWidth)
Abbreviates a String using another given String as replacement marker. This will turn "Now is the time for all good men" into "Now is the time for..." if "..." was defined as the replacement marker.
Specifically:
str
is less than or equal to
maxWidth
, return str
.(substring(str, 0, max-abbrevMarker.length) + abbrevMarker)
.maxWidth
is less than abbrevMarker.length + 1
, throw an
IllegalArgumentException
.maxWidth
.StringUtils.abbreviate(null, "...", *) = null StringUtils.abbreviate("abcdefg", null, *) = "abcdefg" StringUtils.abbreviate("", "...", 4) = "" StringUtils.abbreviate("abcdefg", ".", 5) = "abcd." StringUtils.abbreviate("abcdefg", ".", 7) = "abcdefg" StringUtils.abbreviate("abcdefg", ".", 8) = "abcdefg" StringUtils.abbreviate("abcdefg", "..", 4) = "ab.." StringUtils.abbreviate("abcdefg", "..", 3) = "a.." StringUtils.abbreviate("abcdefg", "..", 2) = IllegalArgumentException StringUtils.abbreviate("abcdefg", "...", 3) = IllegalArgumentException
str
- the String to check, may be nullabbrevMarker
- the String used as replacement markermaxWidth
- maximum length of result String, must be at least abbrevMarker.length + 1
null
if null String inputjava.lang.IllegalArgumentException
- if the width is too smallpublic static java.lang.String abbreviate(java.lang.String str, java.lang.String abbrevMarker, int offset, int maxWidth)
Abbreviates a String using a given replacement marker. This will turn "Now is the time for all good men" into "...is the time for..." if "..." was defined as the replacement marker.
Works like abbreviate(String, String, int)
, but allows you to specify
a "left edge" offset. Note that this left edge is not necessarily going to
be the leftmost character in the result, or the first character following the
replacement marker, but it will appear somewhere in the result.
In no case will it return a String of length greater than maxWidth
.
StringUtils.abbreviate(null, null, *, *) = null StringUtils.abbreviate("abcdefghijklmno", null, *, *) = "abcdefghijklmno" StringUtils.abbreviate("", "...", 0, 4) = "" StringUtils.abbreviate("abcdefghijklmno", "---", -1, 10) = "abcdefg---" StringUtils.abbreviate("abcdefghijklmno", ",", 0, 10) = "abcdefghi," StringUtils.abbreviate("abcdefghijklmno", ",", 1, 10) = "abcdefghi," StringUtils.abbreviate("abcdefghijklmno", ",", 2, 10) = "abcdefghi," StringUtils.abbreviate("abcdefghijklmno", "::", 4, 10) = "::efghij::" StringUtils.abbreviate("abcdefghijklmno", "...", 6, 10) = "...ghij..." StringUtils.abbreviate("abcdefghijklmno", "*", 9, 10) = "*ghijklmno" StringUtils.abbreviate("abcdefghijklmno", "'", 10, 10) = "'ghijklmno" StringUtils.abbreviate("abcdefghijklmno", "!", 12, 10) = "!ghijklmno" StringUtils.abbreviate("abcdefghij", "abra", 0, 4) = IllegalArgumentException StringUtils.abbreviate("abcdefghij", "...", 5, 6) = IllegalArgumentException
str
- the String to check, may be nullabbrevMarker
- the String used as replacement markeroffset
- left edge of source StringmaxWidth
- maximum length of result String, must be at least 4null
if null String inputjava.lang.IllegalArgumentException
- if the width is too smallpublic static java.lang.String abbreviateMiddle(java.lang.String str, java.lang.String middle, int length)
Abbreviates a String to the length passed, replacing the middle characters with the supplied replacement String.
This abbreviation only occurs if the following criteria is met:
Otherwise, the returned String will be the same as the supplied String for abbreviation.
StringUtils.abbreviateMiddle(null, null, 0) = null StringUtils.abbreviateMiddle("abc", null, 0) = "abc" StringUtils.abbreviateMiddle("abc", ".", 0) = "abc" StringUtils.abbreviateMiddle("abc", ".", 3) = "abc" StringUtils.abbreviateMiddle("abcdef", ".", 4) = "ab.f"
str
- the String to abbreviate, may be nullmiddle
- the String to replace the middle characters with, may be nulllength
- the length to abbreviate str
to.public static java.lang.String difference(java.lang.String str1, java.lang.String str2)
Compares two Strings, and returns the portion where they differ. More precisely, return the remainder of the second String, starting from where it's different from the first. This means that the difference between "abc" and "ab" is the empty String and not "c".
For example,
difference("i am a machine", "i am a robot") -> "robot"
.
StringUtils.difference(null, null) = null StringUtils.difference("", "") = "" StringUtils.difference("", "abc") = "abc" StringUtils.difference("abc", "") = "" StringUtils.difference("abc", "abc") = "" StringUtils.difference("abc", "ab") = "" StringUtils.difference("ab", "abxyz") = "xyz" StringUtils.difference("abcde", "abxyz") = "xyz" StringUtils.difference("abcde", "xyz") = "xyz"
str1
- the first String, may be nullstr2
- the second String, may be nullindexOfDifference(CharSequence,CharSequence)
public static int indexOfDifference(java.lang.CharSequence cs1, java.lang.CharSequence cs2)
Compares two CharSequences, and returns the index at which the CharSequences begin to differ.
For example,
indexOfDifference("i am a machine", "i am a robot") -> 7
StringUtils.indexOfDifference(null, null) = -1 StringUtils.indexOfDifference("", "") = -1 StringUtils.indexOfDifference("", "abc") = 0 StringUtils.indexOfDifference("abc", "") = 0 StringUtils.indexOfDifference("abc", "abc") = -1 StringUtils.indexOfDifference("ab", "abxyz") = 2 StringUtils.indexOfDifference("abcde", "abxyz") = 2 StringUtils.indexOfDifference("abcde", "xyz") = 0
cs1
- the first CharSequence, may be nullcs2
- the second CharSequence, may be nullpublic static int indexOfDifference(java.lang.CharSequence... css)
Compares all CharSequences in an array and returns the index at which the CharSequences begin to differ.
For example,
indexOfDifference(new String[] {"i am a machine", "i am a robot"}) -> 7
StringUtils.indexOfDifference(null) = -1 StringUtils.indexOfDifference(new String[] {}) = -1 StringUtils.indexOfDifference(new String[] {"abc"}) = -1 StringUtils.indexOfDifference(new String[] {null, null}) = -1 StringUtils.indexOfDifference(new String[] {"", ""}) = -1 StringUtils.indexOfDifference(new String[] {"", null}) = 0 StringUtils.indexOfDifference(new String[] {"abc", null, null}) = 0 StringUtils.indexOfDifference(new String[] {null, null, "abc"}) = 0 StringUtils.indexOfDifference(new String[] {"", "abc"}) = 0 StringUtils.indexOfDifference(new String[] {"abc", ""}) = 0 StringUtils.indexOfDifference(new String[] {"abc", "abc"}) = -1 StringUtils.indexOfDifference(new String[] {"abc", "a"}) = 1 StringUtils.indexOfDifference(new String[] {"ab", "abxyz"}) = 2 StringUtils.indexOfDifference(new String[] {"abcde", "abxyz"}) = 2 StringUtils.indexOfDifference(new String[] {"abcde", "xyz"}) = 0 StringUtils.indexOfDifference(new String[] {"xyz", "abcde"}) = 0 StringUtils.indexOfDifference(new String[] {"i am a machine", "i am a robot"}) = 7
css
- array of CharSequences, entries may be nullpublic static java.lang.String getCommonPrefix(java.lang.String... strs)
Compares all Strings in an array and returns the initial sequence of characters that is common to all of them.
For example,
getCommonPrefix(new String[] {"i am a machine", "i am a robot"}) -> "i am a "
StringUtils.getCommonPrefix(null) = "" StringUtils.getCommonPrefix(new String[] {}) = "" StringUtils.getCommonPrefix(new String[] {"abc"}) = "abc" StringUtils.getCommonPrefix(new String[] {null, null}) = "" StringUtils.getCommonPrefix(new String[] {"", ""}) = "" StringUtils.getCommonPrefix(new String[] {"", null}) = "" StringUtils.getCommonPrefix(new String[] {"abc", null, null}) = "" StringUtils.getCommonPrefix(new String[] {null, null, "abc"}) = "" StringUtils.getCommonPrefix(new String[] {"", "abc"}) = "" StringUtils.getCommonPrefix(new String[] {"abc", ""}) = "" StringUtils.getCommonPrefix(new String[] {"abc", "abc"}) = "abc" StringUtils.getCommonPrefix(new String[] {"abc", "a"}) = "a" StringUtils.getCommonPrefix(new String[] {"ab", "abxyz"}) = "ab" StringUtils.getCommonPrefix(new String[] {"abcde", "abxyz"}) = "ab" StringUtils.getCommonPrefix(new String[] {"abcde", "xyz"}) = "" StringUtils.getCommonPrefix(new String[] {"xyz", "abcde"}) = "" StringUtils.getCommonPrefix(new String[] {"i am a machine", "i am a robot"}) = "i am a "
strs
- array of String objects, entries may be null@Deprecated public static int getLevenshteinDistance(java.lang.CharSequence s, java.lang.CharSequence t)
Find the Levenshtein distance between two Strings.
This is the number of changes needed to change one String into another, where each change is a single character modification (deletion, insertion or substitution).
The implementation uses a single-dimensional array of length s.length() + 1. See http://blog.softwx.net/2014/12/optimizing-levenshtein-algorithm-in-c.html for details.
StringUtils.getLevenshteinDistance(null, *) = IllegalArgumentException StringUtils.getLevenshteinDistance(*, null) = IllegalArgumentException StringUtils.getLevenshteinDistance("", "") = 0 StringUtils.getLevenshteinDistance("", "a") = 1 StringUtils.getLevenshteinDistance("aaapppp", "") = 7 StringUtils.getLevenshteinDistance("frog", "fog") = 1 StringUtils.getLevenshteinDistance("fly", "ant") = 3 StringUtils.getLevenshteinDistance("elephant", "hippo") = 7 StringUtils.getLevenshteinDistance("hippo", "elephant") = 7 StringUtils.getLevenshteinDistance("hippo", "zzzzzzzz") = 8 StringUtils.getLevenshteinDistance("hello", "hallo") = 1
s
- the first String, must not be nullt
- the second String, must not be nulljava.lang.IllegalArgumentException
- if either String input null
@Deprecated public static int getLevenshteinDistance(java.lang.CharSequence s, java.lang.CharSequence t, int threshold)
Find the Levenshtein distance between two Strings if it's less than or equal to a given threshold.
This is the number of changes needed to change one String into another, where each change is a single character modification (deletion, insertion or substitution).
This implementation follows from Algorithms on Strings, Trees and Sequences by Dan Gusfield and Chas Emerick's implementation of the Levenshtein distance algorithm from http://www.merriampark.com/ld.htm
StringUtils.getLevenshteinDistance(null, *, *) = IllegalArgumentException StringUtils.getLevenshteinDistance(*, null, *) = IllegalArgumentException StringUtils.getLevenshteinDistance(*, *, -1) = IllegalArgumentException StringUtils.getLevenshteinDistance("", "", 0) = 0 StringUtils.getLevenshteinDistance("aaapppp", "", 8) = 7 StringUtils.getLevenshteinDistance("aaapppp", "", 7) = 7 StringUtils.getLevenshteinDistance("aaapppp", "", 6)) = -1 StringUtils.getLevenshteinDistance("elephant", "hippo", 7) = 7 StringUtils.getLevenshteinDistance("elephant", "hippo", 6) = -1 StringUtils.getLevenshteinDistance("hippo", "elephant", 7) = 7 StringUtils.getLevenshteinDistance("hippo", "elephant", 6) = -1
s
- the first String, must not be nullt
- the second String, must not be nullthreshold
- the target threshold, must not be negative-1
if the distance would be greater than the thresholdjava.lang.IllegalArgumentException
- if either String input null
or negative threshold@Deprecated public static double getJaroWinklerDistance(java.lang.CharSequence first, java.lang.CharSequence second)
Find the Jaro Winkler Distance which indicates the similarity score between two Strings.
The Jaro measure is the weighted sum of percentage of matched characters from each file and transposed characters. Winkler increased this measure for matching initial characters.
This implementation is based on the Jaro Winkler similarity algorithm from http://en.wikipedia.org/wiki/Jaro%E2%80%93Winkler_distance.
StringUtils.getJaroWinklerDistance(null, null) = IllegalArgumentException StringUtils.getJaroWinklerDistance("", "") = 0.0 StringUtils.getJaroWinklerDistance("", "a") = 0.0 StringUtils.getJaroWinklerDistance("aaapppp", "") = 0.0 StringUtils.getJaroWinklerDistance("frog", "fog") = 0.93 StringUtils.getJaroWinklerDistance("fly", "ant") = 0.0 StringUtils.getJaroWinklerDistance("elephant", "hippo") = 0.44 StringUtils.getJaroWinklerDistance("hippo", "elephant") = 0.44 StringUtils.getJaroWinklerDistance("hippo", "zzzzzzzz") = 0.0 StringUtils.getJaroWinklerDistance("hello", "hallo") = 0.88 StringUtils.getJaroWinklerDistance("ABC Corporation", "ABC Corp") = 0.93 StringUtils.getJaroWinklerDistance("D N H Enterprises Inc", "D & H Enterprises, Inc.") = 0.95 StringUtils.getJaroWinklerDistance("My Gym Children's Fitness Center", "My Gym. Childrens Fitness") = 0.92 StringUtils.getJaroWinklerDistance("PENNSYLVANIA", "PENNCISYLVNIA") = 0.88
first
- the first String, must not be nullsecond
- the second String, must not be nulljava.lang.IllegalArgumentException
- if either String input null
@Deprecated public static int getFuzzyDistance(java.lang.CharSequence term, java.lang.CharSequence query, java.util.Locale locale)
Find the Fuzzy Distance which indicates the similarity score between two Strings.
This string matching algorithm is similar to the algorithms of editors such as Sublime Text, TextMate, Atom and others. One point is given for every matched character. Subsequent matches yield two bonus points. A higher score indicates a higher similarity.
StringUtils.getFuzzyDistance(null, null, null) = IllegalArgumentException StringUtils.getFuzzyDistance("", "", Locale.ENGLISH) = 0 StringUtils.getFuzzyDistance("Workshop", "b", Locale.ENGLISH) = 0 StringUtils.getFuzzyDistance("Room", "o", Locale.ENGLISH) = 1 StringUtils.getFuzzyDistance("Workshop", "w", Locale.ENGLISH) = 1 StringUtils.getFuzzyDistance("Workshop", "ws", Locale.ENGLISH) = 2 StringUtils.getFuzzyDistance("Workshop", "wo", Locale.ENGLISH) = 4 StringUtils.getFuzzyDistance("Apache Software Foundation", "asf", Locale.ENGLISH) = 3
term
- a full term that should be matched against, must not be nullquery
- the query that will be matched against a term, must not be nulllocale
- This string matching logic is case insensitive. A locale is necessary to normalize
both Strings to lower case.java.lang.IllegalArgumentException
- if either String input null
or Locale input null
public static boolean startsWith(java.lang.CharSequence str, java.lang.CharSequence prefix)
Check if a CharSequence starts with a specified prefix.
null
s are handled without exceptions. Two null
references are considered to be equal. The comparison is case sensitive.
StringUtils.startsWith(null, null) = true StringUtils.startsWith(null, "abc") = false StringUtils.startsWith("abcdef", null) = false StringUtils.startsWith("abcdef", "abc") = true StringUtils.startsWith("ABCDEF", "abc") = false
str
- the CharSequence to check, may be nullprefix
- the prefix to find, may be nulltrue
if the CharSequence starts with the prefix, case sensitive, or
both null
String.startsWith(String)
public static boolean startsWithIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence prefix)
Case insensitive check if a CharSequence starts with a specified prefix.
null
s are handled without exceptions. Two null
references are considered to be equal. The comparison is case insensitive.
StringUtils.startsWithIgnoreCase(null, null) = true StringUtils.startsWithIgnoreCase(null, "abc") = false StringUtils.startsWithIgnoreCase("abcdef", null) = false StringUtils.startsWithIgnoreCase("abcdef", "abc") = true StringUtils.startsWithIgnoreCase("ABCDEF", "abc") = true
str
- the CharSequence to check, may be nullprefix
- the prefix to find, may be nulltrue
if the CharSequence starts with the prefix, case insensitive, or
both null
String.startsWith(String)
public static boolean startsWithAny(java.lang.CharSequence sequence, java.lang.CharSequence... searchStrings)
Check if a CharSequence starts with any of the provided case-sensitive prefixes.
StringUtils.startsWithAny(null, null) = false StringUtils.startsWithAny(null, new String[] {"abc"}) = false StringUtils.startsWithAny("abcxyz", null) = false StringUtils.startsWithAny("abcxyz", new String[] {""}) = true StringUtils.startsWithAny("abcxyz", new String[] {"abc"}) = true StringUtils.startsWithAny("abcxyz", new String[] {null, "xyz", "abc"}) = true StringUtils.startsWithAny("abcxyz", null, "xyz", "ABCX") = false StringUtils.startsWithAny("ABCXYZ", null, "xyz", "abc") = false
sequence
- the CharSequence to check, may be nullsearchStrings
- the case-sensitive CharSequence prefixes, may be empty or contain null
true
if the input sequence
is null
AND no searchStrings
are provided, or
the input sequence
begins with any of the provided case-sensitive searchStrings
.startsWith(CharSequence, CharSequence)
public static boolean endsWith(java.lang.CharSequence str, java.lang.CharSequence suffix)
Check if a CharSequence ends with a specified suffix.
null
s are handled without exceptions. Two null
references are considered to be equal. The comparison is case sensitive.
StringUtils.endsWith(null, null) = true StringUtils.endsWith(null, "def") = false StringUtils.endsWith("abcdef", null) = false StringUtils.endsWith("abcdef", "def") = true StringUtils.endsWith("ABCDEF", "def") = false StringUtils.endsWith("ABCDEF", "cde") = false StringUtils.endsWith("ABCDEF", "") = true
str
- the CharSequence to check, may be nullsuffix
- the suffix to find, may be nulltrue
if the CharSequence ends with the suffix, case sensitive, or
both null
String.endsWith(String)
public static boolean endsWithIgnoreCase(java.lang.CharSequence str, java.lang.CharSequence suffix)
Case insensitive check if a CharSequence ends with a specified suffix.
null
s are handled without exceptions. Two null
references are considered to be equal. The comparison is case insensitive.
StringUtils.endsWithIgnoreCase(null, null) = true StringUtils.endsWithIgnoreCase(null, "def") = false StringUtils.endsWithIgnoreCase("abcdef", null) = false StringUtils.endsWithIgnoreCase("abcdef", "def") = true StringUtils.endsWithIgnoreCase("ABCDEF", "def") = true StringUtils.endsWithIgnoreCase("ABCDEF", "cde") = false
str
- the CharSequence to check, may be nullsuffix
- the suffix to find, may be nulltrue
if the CharSequence ends with the suffix, case insensitive, or
both null
String.endsWith(String)
public static java.lang.String normalizeSpace(java.lang.String str)
Similar to http://www.w3.org/TR/xpath/#function-normalize -space
The function returns the argument string with whitespace normalized by using
to remove leading and trailing whitespace
and then replacing sequences of whitespace characters by a single space.
trim(String)
Java's regexp pattern \s defines whitespace as [ \t\n\x0B\f\r]
For reference:
The difference is that Java's whitespace includes vertical tab and form feed, which this functional will also
normalize. Additionally
removes control characters (char <= 32) from both
ends of this String.
trim(String)
str
- the source String to normalize whitespaces from, may be nullnull
if null String inputPattern
,
trim(String)
,
http://www.w3.org/TR/xpath/#function-normalize-spacepublic static boolean endsWithAny(java.lang.CharSequence sequence, java.lang.CharSequence... searchStrings)
Check if a CharSequence ends with any of the provided case-sensitive suffixes.
StringUtils.endsWithAny(null, null) = false StringUtils.endsWithAny(null, new String[] {"abc"}) = false StringUtils.endsWithAny("abcxyz", null) = false StringUtils.endsWithAny("abcxyz", new String[] {""}) = true StringUtils.endsWithAny("abcxyz", new String[] {"xyz"}) = true StringUtils.endsWithAny("abcxyz", new String[] {null, "xyz", "abc"}) = true StringUtils.endsWithAny("abcXYZ", "def", "XYZ") = true StringUtils.endsWithAny("abcXYZ", "def", "xyz") = false
sequence
- the CharSequence to check, may be nullsearchStrings
- the case-sensitive CharSequences to find, may be empty or contain null
true
if the input sequence
is null
AND no searchStrings
are provided, or
the input sequence
ends in any of the provided case-sensitive searchStrings
.endsWith(CharSequence, CharSequence)
public static java.lang.String appendIfMissing(java.lang.String str, java.lang.CharSequence suffix, java.lang.CharSequence... suffixes)
StringUtils.appendIfMissing(null, null) = null StringUtils.appendIfMissing("abc", null) = "abc" StringUtils.appendIfMissing("", "xyz") = "xyz" StringUtils.appendIfMissing("abc", "xyz") = "abcxyz" StringUtils.appendIfMissing("abcxyz", "xyz") = "abcxyz" StringUtils.appendIfMissing("abcXYZ", "xyz") = "abcXYZxyz"
With additional suffixes,
StringUtils.appendIfMissing(null, null, null) = null StringUtils.appendIfMissing("abc", null, null) = "abc" StringUtils.appendIfMissing("", "xyz", null) = "xyz" StringUtils.appendIfMissing("abc", "xyz", new CharSequence[]{null}) = "abcxyz" StringUtils.appendIfMissing("abc", "xyz", "") = "abc" StringUtils.appendIfMissing("abc", "xyz", "mno") = "abcxyz" StringUtils.appendIfMissing("abcxyz", "xyz", "mno") = "abcxyz" StringUtils.appendIfMissing("abcmno", "xyz", "mno") = "abcmno" StringUtils.appendIfMissing("abcXYZ", "xyz", "mno") = "abcXYZxyz" StringUtils.appendIfMissing("abcMNO", "xyz", "mno") = "abcMNOxyz"
str
- The string.suffix
- The suffix to append to the end of the string.suffixes
- Additional suffixes that are valid terminators.public static java.lang.String appendIfMissingIgnoreCase(java.lang.String str, java.lang.CharSequence suffix, java.lang.CharSequence... suffixes)
StringUtils.appendIfMissingIgnoreCase(null, null) = null StringUtils.appendIfMissingIgnoreCase("abc", null) = "abc" StringUtils.appendIfMissingIgnoreCase("", "xyz") = "xyz" StringUtils.appendIfMissingIgnoreCase("abc", "xyz") = "abcxyz" StringUtils.appendIfMissingIgnoreCase("abcxyz", "xyz") = "abcxyz" StringUtils.appendIfMissingIgnoreCase("abcXYZ", "xyz") = "abcXYZ"
With additional suffixes,
StringUtils.appendIfMissingIgnoreCase(null, null, null) = null StringUtils.appendIfMissingIgnoreCase("abc", null, null) = "abc" StringUtils.appendIfMissingIgnoreCase("", "xyz", null) = "xyz" StringUtils.appendIfMissingIgnoreCase("abc", "xyz", new CharSequence[]{null}) = "abcxyz" StringUtils.appendIfMissingIgnoreCase("abc", "xyz", "") = "abc" StringUtils.appendIfMissingIgnoreCase("abc", "xyz", "mno") = "axyz" StringUtils.appendIfMissingIgnoreCase("abcxyz", "xyz", "mno") = "abcxyz" StringUtils.appendIfMissingIgnoreCase("abcmno", "xyz", "mno") = "abcmno" StringUtils.appendIfMissingIgnoreCase("abcXYZ", "xyz", "mno") = "abcXYZ" StringUtils.appendIfMissingIgnoreCase("abcMNO", "xyz", "mno") = "abcMNO"
str
- The string.suffix
- The suffix to append to the end of the string.suffixes
- Additional suffixes that are valid terminators.public static java.lang.String prependIfMissing(java.lang.String str, java.lang.CharSequence prefix, java.lang.CharSequence... prefixes)
StringUtils.prependIfMissing(null, null) = null StringUtils.prependIfMissing("abc", null) = "abc" StringUtils.prependIfMissing("", "xyz") = "xyz" StringUtils.prependIfMissing("abc", "xyz") = "xyzabc" StringUtils.prependIfMissing("xyzabc", "xyz") = "xyzabc" StringUtils.prependIfMissing("XYZabc", "xyz") = "xyzXYZabc"
With additional prefixes,
StringUtils.prependIfMissing(null, null, null) = null StringUtils.prependIfMissing("abc", null, null) = "abc" StringUtils.prependIfMissing("", "xyz", null) = "xyz" StringUtils.prependIfMissing("abc", "xyz", new CharSequence[]{null}) = "xyzabc" StringUtils.prependIfMissing("abc", "xyz", "") = "abc" StringUtils.prependIfMissing("abc", "xyz", "mno") = "xyzabc" StringUtils.prependIfMissing("xyzabc", "xyz", "mno") = "xyzabc" StringUtils.prependIfMissing("mnoabc", "xyz", "mno") = "mnoabc" StringUtils.prependIfMissing("XYZabc", "xyz", "mno") = "xyzXYZabc" StringUtils.prependIfMissing("MNOabc", "xyz", "mno") = "xyzMNOabc"
str
- The string.prefix
- The prefix to prepend to the start of the string.prefixes
- Additional prefixes that are valid.public static java.lang.String prependIfMissingIgnoreCase(java.lang.String str, java.lang.CharSequence prefix, java.lang.CharSequence... prefixes)
StringUtils.prependIfMissingIgnoreCase(null, null) = null StringUtils.prependIfMissingIgnoreCase("abc", null) = "abc" StringUtils.prependIfMissingIgnoreCase("", "xyz") = "xyz" StringUtils.prependIfMissingIgnoreCase("abc", "xyz") = "xyzabc" StringUtils.prependIfMissingIgnoreCase("xyzabc", "xyz") = "xyzabc" StringUtils.prependIfMissingIgnoreCase("XYZabc", "xyz") = "XYZabc"
With additional prefixes,
StringUtils.prependIfMissingIgnoreCase(null, null, null) = null StringUtils.prependIfMissingIgnoreCase("abc", null, null) = "abc" StringUtils.prependIfMissingIgnoreCase("", "xyz", null) = "xyz" StringUtils.prependIfMissingIgnoreCase("abc", "xyz", new CharSequence[]{null}) = "xyzabc" StringUtils.prependIfMissingIgnoreCase("abc", "xyz", "") = "abc" StringUtils.prependIfMissingIgnoreCase("abc", "xyz", "mno") = "xyzabc" StringUtils.prependIfMissingIgnoreCase("xyzabc", "xyz", "mno") = "xyzabc" StringUtils.prependIfMissingIgnoreCase("mnoabc", "xyz", "mno") = "mnoabc" StringUtils.prependIfMissingIgnoreCase("XYZabc", "xyz", "mno") = "XYZabc" StringUtils.prependIfMissingIgnoreCase("MNOabc", "xyz", "mno") = "MNOabc"
str
- The string.prefix
- The prefix to prepend to the start of the string.prefixes
- Additional prefixes that are valid (optional).@Deprecated public static java.lang.String toString(byte[] bytes, java.lang.String charsetName) throws java.io.UnsupportedEncodingException
toEncodedString(byte[], Charset)
instead of String constants in your codebyte[]
to a String using the specified character encoding.bytes
- the byte array to read fromcharsetName
- the encoding to use, if null then use the platform defaultjava.io.UnsupportedEncodingException
- If the named charset is not supportedjava.lang.NullPointerException
- if the input is nullpublic static java.lang.String toEncodedString(byte[] bytes, java.nio.charset.Charset charset)
byte[]
to a String using the specified character encoding.bytes
- the byte array to read fromcharset
- the encoding to use, if null then use the platform defaultjava.lang.NullPointerException
- if bytes
is nullUnsupportedEncodingException
.public static java.lang.String wrap(java.lang.String str, char wrapWith)
Wraps a string with a char.
StringUtils.wrap(null, *) = null StringUtils.wrap("", *) = "" StringUtils.wrap("ab", '\0') = "ab" StringUtils.wrap("ab", 'x') = "xabx" StringUtils.wrap("ab", '\'') = "'ab'" StringUtils.wrap("\"ab\"", '\"') = "\"\"ab\"\""
str
- the string to be wrapped, may be null
wrapWith
- the char that will wrap str
null
if str==null
public static java.lang.String wrap(java.lang.String str, java.lang.String wrapWith)
Wraps a String with another String.
A null
input String returns null
.
StringUtils.wrap(null, *) = null StringUtils.wrap("", *) = "" StringUtils.wrap("ab", null) = "ab" StringUtils.wrap("ab", "x") = "xabx" StringUtils.wrap("ab", "\"") = "\"ab\"" StringUtils.wrap("\"ab\"", "\"") = "\"\"ab\"\"" StringUtils.wrap("ab", "'") = "'ab'" StringUtils.wrap("'abcd'", "'") = "''abcd''" StringUtils.wrap("\"abcd\"", "'") = "'\"abcd\"'" StringUtils.wrap("'abcd'", "\"") = "\"'abcd'\""
str
- the String to be wrapper, may be nullwrapWith
- the String that will wrap strnull
if null String inputpublic static java.lang.String wrapIfMissing(java.lang.String str, char wrapWith)
Wraps a string with a char if that char is missing from the start or end of the given string.
StringUtils.wrapIfMissing(null, *) = null StringUtils.wrapIfMissing("", *) = "" StringUtils.wrapIfMissing("ab", '\0') = "ab" StringUtils.wrapIfMissing("ab", 'x') = "xabx" StringUtils.wrapIfMissing("ab", '\'') = "'ab'" StringUtils.wrapIfMissing("\"ab\"", '\"') = "\"ab\"" StringUtils.wrapIfMissing("/", '/') = "/" StringUtils.wrapIfMissing("a/b/c", '/') = "/a/b/c/" StringUtils.wrapIfMissing("/a/b/c", '/') = "/a/b/c/" StringUtils.wrapIfMissing("a/b/c/", '/') = "/a/b/c/"
str
- the string to be wrapped, may be null
wrapWith
- the char that will wrap str
null
if str==null
public static java.lang.String wrapIfMissing(java.lang.String str, java.lang.String wrapWith)
Wraps a string with a string if that string is missing from the start or end of the given string.
StringUtils.wrapIfMissing(null, *) = null StringUtils.wrapIfMissing("", *) = "" StringUtils.wrapIfMissing("ab", null) = "ab" StringUtils.wrapIfMissing("ab", "x") = "xabx" StringUtils.wrapIfMissing("ab", "\"") = "\"ab\"" StringUtils.wrapIfMissing("\"ab\"", "\"") = "\"ab\"" StringUtils.wrapIfMissing("ab", "'") = "'ab'" StringUtils.wrapIfMissing("'abcd'", "'") = "'abcd'" StringUtils.wrapIfMissing("\"abcd\"", "'") = "'\"abcd\"'" StringUtils.wrapIfMissing("'abcd'", "\"") = "\"'abcd'\"" StringUtils.wrapIfMissing("/", "/") = "/" StringUtils.wrapIfMissing("a/b/c", "/") = "/a/b/c/" StringUtils.wrapIfMissing("/a/b/c", "/") = "/a/b/c/" StringUtils.wrapIfMissing("a/b/c/", "/") = "/a/b/c/"
str
- the string to be wrapped, may be null
wrapWith
- the char that will wrap str
null
if str==null
public static java.lang.String unwrap(java.lang.String str, java.lang.String wrapToken)
Unwraps a given string from anther string.
StringUtils.unwrap(null, null) = null StringUtils.unwrap(null, "") = null StringUtils.unwrap(null, "1") = null StringUtils.unwrap("\'abc\'", "\'") = "abc" StringUtils.unwrap("\"abc\"", "\"") = "abc" StringUtils.unwrap("AABabcBAA", "AA") = "BabcB" StringUtils.unwrap("A", "#") = "A" StringUtils.unwrap("#A", "#") = "#A" StringUtils.unwrap("A#", "#") = "A#"
str
- the String to be unwrapped, can be nullwrapToken
- the String used to unwrappublic static java.lang.String unwrap(java.lang.String str, char wrapChar)
Unwraps a given string from a character.
StringUtils.unwrap(null, null) = null StringUtils.unwrap(null, '\0') = null StringUtils.unwrap(null, '1') = null StringUtils.unwrap("\'abc\'", '\'') = "abc" StringUtils.unwrap("AABabcBAA", 'A') = "ABabcBA" StringUtils.unwrap("A", '#') = "A" StringUtils.unwrap("#A", '#') = "#A" StringUtils.unwrap("A#", '#') = "A#"
str
- the String to be unwrapped, can be nullwrapChar
- the character used to unwrappublic static int[] toCodePoints(java.lang.CharSequence str)
Converts a CharSequence
into an array of code points.
Valid pairs of surrogate code units will be converted into a single supplementary code point. Isolated surrogate code units (i.e. a high surrogate not followed by a low surrogate or a low surrogate not preceded by a high surrogate) will be returned as-is.
StringUtils.toCodePoints(null) = null StringUtils.toCodePoints("") = [] // empty array
str
- the character sequence to convertpublic static java.lang.String valueOf(char[] value)
char
array or null.value
- the character array.String.valueOf(char[])
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