For anyone who has to write regex expressions, this little tool will be quite helpful. I use regular expressions while programming, but I don't use them often enough to be able to just write them off the top of my head. I often find myself popping open a linux command line and testing the out there until I get what I'm looking for.
"The Regex Coach is a graphical application for Windows and Linux/x86 which can be used to experiment with (Perl-compatible) regular expressions interactively."
It's free for personal use. Download and try it out today.
Thanks to C82.net for his great site and "wildy useful web programs". Maybe you'll want to check out his others.