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Replacement String Characters

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
Backslash	Backslash followed by any character that does not form a token	A backslash that is followed by any character that does not form a replacement string token in combination with the backslash inserts the escaped character literally.	Replacing with `\!` yields `!`	no	3.7 error	no	no	no	no	YES	YES	error	YES	extended	no	no	YES	no	sed	YES	no	no	error
Backslash	A backslash that does not form a token	A backslash that is not part of a replacement string token is a literal backslash.	Replacing with `\!` yields `\!`	YES	YES	YES	YES	YES	YES	no	no	error	no	default	YES	YES	no	YES	default	no	YES	YES	error
Backslash	Trailing backslash	A backslash at the end of the replacement string is a literal backslash.	Replacing with `\` yields `\`	YES	error	YES	YES	YES	YES	error	no	error	error	default	YES	YES	no	YES	default	YES	YES	YES	error
Backslash	`\\`	A backslash escapes itself.	Replacing with `\\` yields `\`	YES	YES	no	no	no	no	YES	YES	YES	YES	extended	YES	YES	YES	YES	sed	YES	YES	YES	YES
Dollar	A dollar that does not form a token	A dollar sign that does not form a replacement string token is a literal dollar sign.	Replacing with `$!` yields `$!`	YES	YES	YES	YES	error	YES	error	error	YES	error	error	YES	YES	YES	YES	YES	YES	YES	YES	error
Dollar	Trailing dollar	A dollar sign at the end of the replacement string is a literal dollar sign.	Replacing with `$` yields `$`	YES	YES	YES	YES	error	YES	error	error	YES	error	error	YES	YES	YES	YES	default VC’15 sed VC’10	YES	YES	YES	error
Dollar	`$$`	A dollar sign escapes itself.	Replacing with `$$` yields `$`	YES	no	YES	YES	YES	YES	error	error	no	error	YES	no	YES	no	no	default	all default	no	no	error
Dollar	`\$`	A backslash escapes a dollar sign.	Replacing with `\$` yields `$`	YES	3.7 error	no	no	no	no	YES	YES	error	YES	extended	YES	YES	YES	no	sed	YES	no	no	YES
Hexadecimal escape	`\xF` where F is a single hexadecimal digit	Inserts the character at the specified position in the ASCII table	`\xA` inserts a line feed control character	no	3.7 error	no	no	no	no	no	no	error	YES	extended	string	no	string	string	string	YES	string	no	error
Hexadecimal escape	`\x7F` where 7F are 2 hexadecimal digits between 00 and 7F	Inserts the character at the specified position in the ASCII table	`\x40` inserts `@`	YES	string	string	no	string	no	no	no	error	YES	extended	string	no	string	string	string	YES	string	no	error
Hexadecimal escape	`\xFF` where FF are 2 hexadecimal digits	Inserts the character at the specified position in the code page	`\xA9` inserts `©` when using the Latin-1 code page	YES	string	string	no	string	no	no	no	error	YES	extended	no	no	no	no	string	YES	string	no	error
Unicode escape	`\uFFFF` where FFFF are 4 hexadecimal digits	Inserts a specific Unicode code point.	`\u00E0` inserts `à`. `\u00A9` inserts `©`	YES	string	string	no	string	no	string	YES	error	no	extended error	no	no	string	1.9 string	string	no	string	no	error
Unicode escape	`\u{FFFF}` where FFFF are 1 to 4 hexadecimal digits	Inserts a specific Unicode code point.	`\u{E0}` inserts `à`. `\u{A9}` inserts `©`	V2	no	string	no	string	no	no	no	error	no	no	7.0.0 string	no	string	1.9 string	no	no	no	no	error
Unicode escape	`\u{10FFFF}` where 10FFFF is a hexadecimal value between 0 and 10FFFF	Inserts a specific Unicode code point.	`\u{1D400}` inserts `𝐀`	no	no	string	no	string	no	no	no	error	no	no	7.0.0 string	no	no	1.9 string	no	no	no	no	error
Unicode escape	`\x{FFFF}` where FFFF are 1 to 4 hexadecimal digits	Inserts a specific Unicode code point.	`\x{E0}` inserts `à`. `\x{A9}` inserts `©`	YES	no	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	YES	no	no	error
Unicode escape	`\x{10FFFF}` where 10FFFF is a hexadecimal value between 0 and 10FFFF	Inserts a specific Unicode code point.	`\x{1D400}` inserts `𝐀`	no	no	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	no	no	no	error
Unicode escape	`\U0010FFFF` where 0010FFFF are 8 hexadecimal digits between 00000000 and 0010FFFF	Inserts a specific Unicode code point.	`\U0001D400` inserts `𝐀`	no	string	no	no	no	no	no	YES	no	no	string	no	no	string	no	string	no	8.6 string	no	error
Character escape	`\n`, `\r` and `\t`	Insert an LF character, CR character and a tab character respectively	`\r\n` inserts a Windows CRLF line break	YES	YES	string	no	string	no	string	no	error	YES	extended	string	no	string	string	string	YES	string	no	error
Character escape	`\a`	Insert the “alert” or “bell” control character (ASCII 0x07)		no	YES	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	YES	no	no	error
Character escape	`\b`	Insert the “backspace” control character (ASCII 0x08)		no	YES	no	no	no	no	no	no	error	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Character escape	`\e`	Insert the “escape” control character (ASCII 0x1B)		no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	YES	no	no	error
Character escape	`\f`	Insert the “form feed” control character (ASCII 0x0C)		no	YES	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	YES	no	no	error
Character escape	`\v`	Insert the “vertical tab” control character (ASCII 0x0B)		no	YES	no	no	no	no	no	no	error	no	extended 10.45	no	no	no	no	no	YES	no	no	error
Control character escape	`\cA` through `\cZ`	Insert an ASCII character Control+A through Control+Z, equivalent to `\x01` through `\x1A`	`\cM\cJ` inserts a Windows CRLF line break	no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	YES	no	no	error
Control character escape	`\ca` through `\cz`	Insert an ASCII character Control+A through Control+Z, equivalent to `\x01` through `\x1A`	`\cm\cj` inserts a Windows CRLF line break	no	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	YES	no	no	error
NULL escape	`\0`	Insert the NULL character		no	YES	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	all default	no	no	error
Octal escape	`\o{7777}` where 7777 is any octal number	Inserts the character at the specified position in the active code page	`\o{20254}` inserts `€` when using Unicode	V2	3.7 error	no	no	no	no	no	no	error	YES	extended	no	no	no	no	no	no	no	no	error
Octal escape	`\10` through `\77`	Inserts the character at the specified position in the ASCII table	`\77` inserts `?`	no	no	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Octal escape	`\100` through `\177`	Inserts the character at the specified position in the ASCII table	`\100` inserts `@`	no	YES	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Octal escape	`\200` through `\377`	Inserts the character at the specified position in the active code page	`\377` inserts `ÿ` when using the Latin-1 code page	no	YES	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Octal escape	`\400` through `\777`	Inserts the character at the specified position in the active code page	`\777` inserts `ǿ` when using Unicode	no	no	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	no	no	no	error
Octal escape	`\01` through `\07`	Inserts the character at the specified position in the ASCII table	`\07` inserts the “bell” character	no	YES	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	all default	no	no	error
Octal escape	`\010` through `\077`	Inserts the character at the specified position in the ASCII table	`\077` inserts `?`	no	YES	no	no	no	no	no	no	no	YES	extended 10.45	no	no	no	no	no	all default	no	no	error
Octal escape	`\0100` through `\0177`	Inserts the character at the specified position in the ASCII table	`\0100` inserts `@`	no	no	no	no	no	no	no	no	no	no	extended 10.21–10.44 error	no	no	no	no	no	all default	no	no	error
Octal escape	`\0200` through `\0377`	Inserts the character at the specified position in the active code page	`\0377` inserts `ÿ` when using the Latin-1 code page	no	no	no	no	no	no	no	no	no	no	extended 10.21–10.44 error	no	no	no	no	no	all default	no	no	error
Octal escape	`\0400` through `\0777`	Inserts the character at the specified position in the active code page	`\0777` inserts `ǿ` when using Unicode	no	no	no	no	no	no	no	no	no	no	extended 10.21–10.44 error	no	no	no	no	no	all default	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