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Regex Tester
Build and debug regular expressions with instant feedback. Matches are highlighted in your test string and broken out into a table with their index and capture groups. Toggle flags (g, i, m, s, u, y) with a click.
1 match
🔒 This tool runs entirely in your browser. Your data is never uploaded.
Frequently asked questions
Which regex flavour does it use?＋
JavaScript's regular-expression engine, so patterns behave exactly as they will in the browser and Node.js.
Can I see capture groups?＋
Yes — matches are highlighted live and numbered or named capture groups are listed so you can debug the pattern.
Which flags are supported?＋
The standard JavaScript flags, including g (global), i (case-insensitive), m (multiline) and s (dotall).