I've used lots of regex tools over the years, but I stopped looking once I bought RegexBuddy. See a demo: http://www.regexbuddy.com/demotest.html http://www.re

I've used lots of regex tools over the years, but I stopped looking once I bought RegexBuddy. See a demo: http://www.regexbuddy.com/demotest.html http://www.regexbuddy.com/demotest.html It's a Windows program, but runs on Linux via WINE. It lets you debug regexes, has live highlighting of matched text, generates regex code in 15+ languages (Perl, Python, Ruby, PHP, C, C#, C++, Delphi, Java, Javascript, MySQL, etc) and is all around awesome. I'm not affiliated with this program, but it is the BEST regex creation/testing program available anywhere. It will save you oodles of time if you create (or debug) regular expressions more than 2 times in a year. It's the best software product I've ever bought with my own money.