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Regex Tester

Test regular expressions with real-time matching and highlighting

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Test String
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Frequently Asked Questions

  • What regex flavor does this use?

    This tool uses JavaScript's built-in RegExp engine, which supports most standard regex features including lookaheads, lookbehinds, and named groups.

  • Can I use replace mode?

    Yes, enable replace mode to test replacement patterns. Supports special replacement patterns like $1, $&, $`, and $'.