Fundamentals of Perl
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11.19. Special character classes

Table 11-2. Special character classes

Expression	Meaning
\w	Word characters: [a-zA-Z0-9_] (but \w is locale dependent)
\d	Digits: [0-9]
\s	[\f\t\n\r ] form-feed, tab, newline, carriage return and SPACE
\W	[^\w]
\D	[^\d]
\S	[^\s]
[:class:]	POSIX character classes (alpha, alnum...)
\p{...}	Unicode definitions (IsAlpha, IsLower, IsHebrew, ...)

See also perldoc perlre and perldoc perluniintro

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