Boost-Supported RegEx Character Classes

Version:

2023.1

Last modified: May 17, 2023

Boost.Regex always support these class names:

Name	POSIX-standard name	Description	Example
[:alnum:]	Yes	Alpha-numeric characters	[A-Za-z0-9]
[:alpha:]	Yes	Alphabetic characters	[A-Za-z]
[:blank:]	Yes	Whitespace characters that are not line separators	space or tab
[:cntrl:]	Yes	Control characters	Any character not part of the character class: [:upper:], [:lower:], [:alpha:], [:digit:], [:punct:], [:graph:], [:print:], [:xdigit:]
[:d:]	No	Decimal digits	[0–9]
[:digit:]	Yes	Decimal digits	[0–9]
[:graph:]	Yes	Characters with graphic representation	[A–Z][a–z][0–9][:punct:]
[:l:]	No	Lowercase characters	[a–z]
[:lower:]	Yes	Lowercase characters	[a–z]
[:print:]	Yes	Characters that display when printed	[:graph:] and space
[:punct:]	Yes	Punctuation characters	! ' # S % & ' ( ) * + , - . / : ; < = > ? @ [ / ] ^ _ { \| } ~
[:s:]	No	Whitespace characters	tab, new line, vertical tab, form feed, carriage return, space
[:space:]	Yes	Whitespace characters	tab, new line, vertical tab, form feed, carriage return, space
[:unicode:]	No	Extended characters whose code point value is above 255	Any character with code point above 255.
[:u:]	No	Uppercase characters	[A–Z]
[:upper:]	Yes	Uppercase characters	[A–Z]
[:w:]	No	Alphanumeric characters and underscore	[A-Za-z0-9_]
[:word:]	No	Alphanumeric characters and underscore	[A-Za-z0-9_]
[:xdigit:]	Yes	Hexadecimal digit characters	[A-Fa-f0-9]