(Useful) Stupid Regex Tricks?

careysb writes to mention that in the same vein as '*nix tricks' and 'VIM tricks', it would be nice to see one on regular expressions and the programs that use them. What amazingly cool tricks have people discovered with respect to regular expressions in everyday life as a developer or power user?"http://developers.slashdot.org/slash...8/11/10/131234
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