Regex Tester
Free online regex tester with live match highlighting, capture group display, and pattern explanations. Test regular expressions against any text instantly in your browser.
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Writing a regular expression rarely works on the first try, and the real test isn't whether a pattern looks right, it's whether it actually matches the specific strings it's supposed to and rejects the ones it isn't, edge cases included, something that's nearly impossible to verify just by reading the pattern itself. This tool runs a regex against real sample text, highlighting every match live as the pattern changes and displaying each capture group separately, so the actual matching behavior stays visible while a pattern is still being refined rather than only after it ships in actual code.
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Useful for iterating on a pattern against a handful of test strings until it correctly separates the ones that should match from the ones that shouldn't, checking exactly what a capture group pulls out of a match, or confirming a regex handles an edge case before it goes into production code.
Key features
- Clean interface
- Fast processing
- No signup required
- Works offline