RegExLib – Regular Expression Library
http://regexlib.com/

RegExLib.com is the Internet’s first Regular Expression Library. Currently they have indexed 1796 expressions from 1192 contributors around the world. They hope you’ll find their site useful and come back whenever you’re looking for an expression for a particular task, or have just figured out a new expression that does something useful. This has been added to World Wide Web Reference Subject Tracer™ Information Blog.