What are some alternatives?
When comparing RegexBuddy and regular expressions 101, you can also consider the following products
RegExr - RegExr.com is an online tool to learn, build, and test Regular Expressions.
Expresso - The award-winning Expresso editor is equally suitable as a teaching tool for the beginning user of regular expressions or as a full-featured development environment for the experienced programmer with an extensive knowledge of regular expressions.
Regex Hero - Online Silverlight regular expression tester with instantaneous highlighting, C# and VB.NET code generation, code completion, regex analysis, benchmarking, and more.
RegexMagic - Use RegexMagic to generate complete regular expressions to your specifications by using RegexMagic's flexible patterns, instead of the cryptic regex syntax.
The Regex Coach - The Regex Coach is a graphical application for Windows which can be used to experiment with...
Regulex - Open-source, regular expression parser and visualizer.