Debuggex
7.3#2 in regular expression testersFrom $5 a monthFree planWebSelf-hosted
VisitDebuggex suits people who need to inspect and test regular expressions for JavaScript, Python, or PCRE. Its unit tests and expression repository may be useful for users building or maintaining patterns.
It suits developers and learners who need browser-based regex checks, explanations, capture groups, replacement previews, or generated code. Offline local processing may suit users who prefer not to transmit patterns.