I'm a big fan of visualization. Seeing my del.icio.us feed for the day, I saw this RegEx visualizer built by Oliver Steele. It's not meant to be a regex workbench or validator (It does not recognize certain character ranges like [1-5] or qualifiers...
I recently wrote a short article as an overview to why regular expressions should be in every developer's toolbox. I actually left the real discussion of regex to other experts so I used a lot of link-love. [:-)] Seeing that Mike Malone posted an...