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Regex Tester

Test JavaScript regular expressions with live match highlighting and groups.

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How to use the Regex Tester

  1. 1

    Enter a pattern and flags.

  2. 2

    Paste a test string.

  3. 3

    See matches and capture groups highlighted live.

Frequently asked questions

Which regex flavour is used?

JavaScript (ECMAScript) regular expressions, the same engine your browser uses.