John Cox has a quick link that he discovered over on del.icio.us - a PHP regular expression tutorial.

Another quick find from del.icio.us. This time to address my regex phobia. The Regular Expression PHP Tutorial is a collection of regex tutorials rewritten to be a single sitting read. It does get a little basic but the pattern matching portion is good. It's worth the visit for those that are regex challenged such as myself.

There's not a day that goes by that I don't see someone out there needing a regular expression - whether it's just for a simple mattern match or a complicated string replacement. They can be oh so handy in so many situations, but mastering them really takes some time and patience. (Plus, there's also other great resources out there...)