Hey » I Want Your Regular Expressions » Now

I really like regular expressions (RegEx's) and I have this crazy fascination with learning and using them whenever and wherever I get a chance. If you don't know what a regular expressions is, the Sun Developer's Network's states:

"A regular expression is a pattern of characters that describes a set of strings." » Simple enough.

I picked up the bug for RegEx's after trying to "think my way through" a JavaScript form validation function without any experience in regular expressions or JavaScript for that matter.

That event led me to pick up Mastering Regular Expressions, III ed. By Jeffrey Friedl; OReilly's JavaScript, The Definitive Guide, By David Flanagan, and a fierce desire to learn more about the almost alien-looking esoteric characters that were here to take over my programming world.

The good news I found out later was not only that I am not the only RegEx fan that has been drawn in by their mysterious attraction. Many of the coders and developers that I've found to respect, have this crazy bug too.

So, what I want to do now, is put together a RegEx Library right here on this post for all of the coolest regular expressions you know. So, post me your regular expression(s), with a brief description.