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Character Class Description
. Matches any character except \n.
[aeiou] Matches any single character specified in the set.
[^aeiou] Matches any character not specified in the set.
[3-7a-dA-D] Matches any character specified in the specified ranges (in the example the ranges are 3¨C7, a¨Cd, A¨CD).
\w Matches any word character; that is, any alphanumeric character or the underscore (_).
\W Matches any nonword character.
\s Matches any whitespace character (space, tab, form-feed, newline, carriage return, or vertical feed).
\S Matches any nonwhitespace character.
\d Matches any decimal character.
\D Matches any nondecimal character.
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