Regular Expressions (regexes) are powerful but hard to write and very hard to debug. Regex Builder makes working with regexes easier.

• Your regex runs continuously on the text as you edit it, providing instant feedback.
• Run the selected subset of the regex with F5 to quickly narrow down why regexes aren't matching.
• See matches, groups, and captures in a tree to confirm they're capturing what you intended.
• Use the '>' menu for regex syntax reminders to quickly construct expressions.
• Copy and paste C# or VB code with the regex properly string escaped.
• Copy all matches to the clipboard to use elsewhere quickly.
• 'Double-click debug' regex problems with an xml format that loads the regex, options, and text in one step.

I used Regex Builder to help write and debug regexes for Visual Studio editor automated tests. I copied several examples-to-match when first writing regexes to instantly test them as I was writing them. I debugged failed matches by running parts of the regex to narrow down what wasn't matching. My test harness wrote unexpected regex match failures to the xml file format, so I could double-click the file to immediately debug the problem.