The RegExplorer homepage (http://regexplorer.sourceforge.net) has been updated with an article explaining the basics of Regular Expressions. Go check it out.
RegExplorer 0.1.6 is now released with support for Perl, PHP and Qt. Do you have problems with writing Regular Expressions? If so this could be just what you were looking for. Got to http://regexplorer.sourceforge.net/ for more information.
A Debian package of RegExplorer 0.1.4 can be found at
http://www.debian.org/Packages/unstable/x11/regexplorer.html
Visit the project page https://sourceforge.net/project/?group_id=449 for more information.