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Dev Utilities

Regex Tester

Enter a regular expression and a block of test text to see every match highlighted, along with capture groups. Useful for building and debugging a regex before dropping it into code, without needing to run a script just to test a pattern.

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  • Runs entirely in your browser
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Use Regex Tester - free

Frequently asked questions

Which regex flavor does this use?

Standard JavaScript regular expression syntax, the same engine used in browsers and Node.js.

Can I see capture groups, not just the full match?

Yes, each match’s capture groups are shown alongside the full match.

Does this support flags like case-insensitive or global?

Yes, common flags (g, i, m, s) can be toggled.

Test a regex - free and instant.

Open Regex Tester
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