Similar Tools other ways to test your regular expressions
These are my competitors. If you find one of them to be more useful than RegexPlanet, please let me know why!
Online
Rubular - Ruby
RegExr - Flash
RegexPal - JavaScript
MyRegExp - Java (via Applet)
Fat Client
Expresso - Microsoft Windows/.NET
RegexBuddy - Microsoft Windows
Regex Coach - Microsoft Windows