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Posix Classes

Class Matches
:alpha: Any alphabetic character.
:upper: Any uppercase alphabetic character.
:lower: Any lowercase alphabetic character
:digit: Any digit. Same as \d and similar to [0-9].
:alnum: Any alphanumeric character. Same as \w.
:xdigit: Any hexadecimal digit. Same as [0-9A-Fa-f].
:blank:

Space or a tab.

:space:

Any whitespace character including tab, space, newline, carriage return, and form feed. Same as \s and similar to [ \t\n\r\f].
:print: Any alphanumeric, punctuation, or space character.
:punct: Any punctuation character
:graph: Any alphanumeric or punctuation character.
:cntrl: Any character not part of the character classes [:upper:], [:lower:], [:alpha:], [:digit:], [:punct:], [:graph:], [:print:], or [:xdigit:].
:word: Any alphanumeric character, plus the underscore (_)
ascii The ASCII characters, in the Hexadecimal range 0 - 7F