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Replacement Strings Reference: Case Conversion and Case Folding

Feature	Syntax	Description	Example	JGsoft	Python	JavaScript	VBScript	XRegExp	.NET	Java	ICU	RE2	Perl	PCRE2	PHP	Delphi	R	Ruby	std::regex	Boost	Tcl	Oracle	XPath
Case Conversion	`\U0` and `\U1` through `\U99`	Insert the whole regex match or the 1st through 99th backreference with all letters in the matched text converted to uppercase.	Replacing `.+` with `\U0` in `HeLlO WoRlD` yields `HELLO WORLD`	YES	3.7 error	no	no	no	no	no	no	error	no	no	no	YES	no	no	no	no	no	no	error
Case Conversion	`\L0` and `\L1` through `\L99`	Insert the whole regex match or the 1st through 99th backreference with all letters in the matched text converted to lowercase.	Replacing `.+` with `\L0` in `HeLlO WoRlD` yields `hello world`	YES	3.7 error	no	no	no	no	no	no	error	no	no	no	YES	no	no	no	no	no	no	error
Case Conversion	`\F0` and `\F1` through `\F99`	Insert the whole regex match or the 1st through 99th backreference with the first letter in the matched text converted to uppercase and the remaining letters converted to lowercase.	Replacing `.+` with `\F0` in `HeLlO WoRlD` yields `Hello world`	YES	3.7 error	no	no	no	no	no	no	error	no	extended error	no	YES	no	no	no	no	no	no	error
Case Conversion	`\I0` and `\I1` through `\I99`	Insert the whole regex match or the 1st through 99th backreference with the first letter of each word in the matched text converted to uppercase and the remaining letters converted to lowercase.	Replacing `.+` with `\I0` in `HeLlO WoRlD` yields `Hello World`	YES	3.7 error	no	no	no	no	no	no	error	no	extended error	no	YES	no	no	no	no	no	no	error
Case Conversion	`\U`	All literal text and all text inserted by replacement text tokens after `\U` up to the next `\E` or `\L` is converted to uppercase.	Replacing `(\w+) (\w+)` with `\U$1 CrUeL \E$2` in `HeLlO WoRlD` yields `HELLO CRUEL WoRlD`	no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	all default	no	no	error
Case Conversion	`\L`	All literal text and all text inserted by replacement text tokens after `\L` up to the next `\E` or `\U` is converted to lowercase.	Replacing `(\w+) (\w+)` with `\L$1 CrUeL \E$2` in `HeLlO WoRlD` yields `hello cruel WoRlD`	no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	all default	no	no	error
Case Conversion	`\u`	The first character after `\u` that is inserted into the replacement text as a literal or by a token is converted to uppercase.	Replacing `(\w+) (\w+)` with `\u$1 \ucRuEl \u$2` in `hElLo wOrLd` yields `HElLO CRuEl WOrLd`	no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	all default	no	no	error
Case Conversion	`\l`	The first character after `\l` that is inserted into the replacement text as a literal or by a token is converted to lowercase.	Replacing `(\w+) (\w+)` with `\l$1 \lCrUeL \l$2` in `HeLlO WoRlD` yields `heLlO crUeL woRlD`	no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	all default	no	no	error
Case Conversion	`\u\L`	The first character after `\u\L` that is inserted into the replacement text as a literal or by a token is converted to uppercase and the following characters up to the next `\E` or `\U` are converted to lowercase.	Replacing `(\w+) (\w+)` with `\u\L$1 \uCrUeL \E\u$2` in `HeLlO wOrLd` yields `Hello Cruel WOrLd`	no	3.7 error	no	no	no	no	no	no	error	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Case Conversion	`\l\U`	The first character after `\l\U` that is inserted into the replacement text as a literal or by a token is converted to lowercase and the following characters up to the next `\E` or `\L` are converted to uppercase.	Replacing `(\w+) (\w+)` with `\l\U$1 \lCrUeL \E\l$2` in `HeLlO WoRlD` yields `hELLO cRUEL woRlD`	no	3.7 error	no	no	no	no	no	no	error	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Case Conversion	`\L\u`	The first character after `\L\u` that is inserted into the replacement text as a literal or by a token is converted to uppercase and the following characters up to the next `\E` or `\U` are converted to lowercase.	Replacing `(\w+) (\w+)` with `\L\u$1 \uCrUeL \E\u$2` in `HeLlO wOrLd` yields `Hello Cruel WOrLd`	no	3.7 error	no	no	no	no	no	no	error	no	no	no	no	no	no	no	all default	no	no	error
Case Conversion	`\U\l`	The first character after `\U\l` that is inserted into the replacement text as a literal or by a token is converted to lowercase and the following characters up to the next `\E` or `\L` are converted to uppercase.	Replacing `(\w+) (\w+)` with `\U\l$1 \lCrUeL \E\l$2` in `HeLlO WoRlD` yields `hELLO cRUEL woRlD`	no	3.7 error	no	no	no	no	no	no	error	no	no	no	no	no	no	no	all default	no	no	error
Case Folding	`\F`	Unicode case folding is applied to all literal text and all text inserted by replacement text tokens after `\F` up to the next `\E`, `\U`, or `\L`. Case folding converts most characters to lowercase, but some to uppercase or to alternative lowercase characters.	Replacing `(\w+) (\w+)` with `\F$1 CrUeL \E$2` in `HeLlO WoRlD` yields `hello cruel WoRlD`	no	3.7 error	no	no	no	no	no	no	error	5.16	extended error	no	no	no	no	no	no	no	no	error
Case Folding	`\u\F`	The first character after `\u\F` that is inserted into the replacement text as a literal or by a token is converted to uppercase. Unicode case folding is applied to all following characters up to the next `\E`, `\U`, or `\L`.	Replacing `(\w+) (\w+)` with `\u\F$1 \uCrUeL \E\u$2` in `HeLlO wOrLd` yields `Hello Cruel WOrLd`	no	3.7 error	no	no	no	no	no	no	error	5.16	extended error	no	no	no	no	no	no	no	no	error
Case Folding	`\l\F`	The first character after `\l\U` that is inserted into the replacement text as a literal or by a token is converted to lowercase. Unicode case folding is applied to all following characters up to the next `\E`, `\U`, or `\L`.	Replacing `(\w+) (\w+)` with `\l\F$1 \lCrUeL \E\l$2` in `HeLlO WoRlD` yields `hello cruel woRLD`	no	3.7 error	no	no	no	no	no	no	error	5.16	extended error	no	no	no	no	no	no	no	no	error
Feature	Syntax	Description	Example	JGsoft	Python	JavaScript	VBScript	XRegExp	.NET	Java	ICU	RE2	Perl	PCRE2	PHP	Delphi	R	Ruby	std::regex	Boost	Tcl	Oracle	XPath