Debuggex is described as 'Intuitive visual regular expression debugger, tester, and helper' and is an website in the development category. There are more than 25 alternatives to Debuggex, not only websites but also apps for a variety of platforms, including Windows, Mac, Linux and Self-Hosted apps. The best Debuggex alternative is RegExr, which is both free and Open Source. Other great sites and apps similar to Debuggex are regular expressions 101, Expresso, RegexMate and Wildcard.
Pyrexp is a regex testing tool that allows to validate regex patterns, test regular expressions against strings, and also includes a regex visualizer that provides graphical visualization of regex patterns.
