HTML and CSS Reference
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Any nonwhitespace character
Any word character (letters, digits, and the underscore)
Any nonword character
Any digit (0-9)
Any nondigit
The characters a , b , and c in that order
\1, \2, ...
First matched pattern, second matched pattern, ...
For more information on regular expressions, including lots more examples, some advanced features I
haven't gone into here, and details about dialect variations, I recommend Mastering Regular Expressions ,
3rd Edition, by Jeffrey E. F. Friedl (O'Reilly, 2006).
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