I thought this might be of interest to those of us who have difficulty writing regular expressions.
http://regexplorer.sourceforge.net/
This is a graphical tool that lets you interactively tinker with a regular expression and instantly see how it performs on your favorite textfile.
It's written using the QT graphical toolkit, which means eventually it may find its way to Windows. Right now Linux binaries are available and the source may compile on other Unix-derived platforms.
