Regex POSIX Bracket Expressions

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POSIX	Description	ASCII
[:alnum:]	Alphanumeric characters	[a-zA-Z0-9]
[:alpha:]	Alphabetic characters	[a-zA-Z]
[:ascii:]	ASCII characters	[\x00-\x7F]
[:blank:]	Space and tab	[ \t]
[:cntrl:]	Control characters	[\x00-\x1F\x7F]
[:digit:]	Digits	[0-9]
[:graph:]	Visible characters (anything except spaces and control characters)	[\x21-\x7E]
[:lower:]	Lowercase letters	[a-z]
[:print:]	Visible characters and spaces (anything except control characters)	[\x20-\x7E]
[:punct:]	Punctuation (and symbols)	[!”#$%&’()*+,-./:;<=>?\@[\]^_‘{\|}~]
[:space:]	All whitespace characters, including line breaks	[ \t\r\n\v\f]
[:upper:]	Uppercase letters	[A-Z]
[:word:]	Word characters (letters, numbers and underscores)	[A-Za-z0-9_]
[:xdigit:]	Hexadecimal digits	[A-Fa-f0-9]

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