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Perl
Characters
metacharacters:
\ | ( ) [ { $ * + ? .
whitespace:
\s
is the same as
[\t\n\r\f]
letter and number characters:
\w
is the same as
[a-zA-Z_0-9]
digit characters:
\d
is the same as
[0-9]
Chris Paciorek 2006-04-02