Really nice!
An alternative is RegEx Pal – [regexpal.com]

Nice find… doesn’t seem quite as robust as this site, but I think it’s more responsive since it’s not built on Flash.

For the PHP & MySQL intro course I took last semester, we used an app called JEdit preinstalled and configured with the settings and plugins the professor wanted and it had a feature (that I think came in the form of a plugin) which allowed you to test your regular expression, but you still had to remember all the syntax to create your regular expressions and it would only highlight each pattern matched one at a time (you’d have to cycle through the matches). I’d have to use a regular expression cheat sheet alongside this app to do my regular expressions.

This website tool builds in the cheat sheet and highlights all matches simultaneously making it far more useful than JEdit. I’ll be using this website with great regularity. Thanks and very nice find!

Excellent find, will be very handy for quick testing, and having the syntax there makes it doubly useful.

Yeah, I don’t use regular expressions enough to remember all of the syntax so I normally have a cheat sheet next to me. This definitely solves that problem.