xregexp

XRegExp is an open source (MIT License) JavaScript library that provides augmented and extensible regular expressions. You get new syntax, flags, and methods beyond what browsers support natively. XRegExp is also a regex utility belt with tools to make your client-side grepping simpler and more powerful, while freeing you from worrying about pesky cross-browser inconsistencies and the dubious lastIndex property.

Website:http://xregexp.com/

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