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Free Regex Tester

Test regular expressions against text live.

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About the Regex Tester

Free regex tester. Write a regular expression, toggle flags, and see matches and capture groups highlighted in your test string in real time — right in your browser.

How it works

  1. 1

    Enter a pattern

    Type your regular expression.

  2. 2

    Add test text

    Paste the string to match against.

  3. 3

    See matches

    Matches and groups are highlighted live.

Frequently asked questions

It uses JavaScript's regular expression engine, matching what runs in browsers and Node.js.

Yes — toggle g, i, m, s and u flags and see matches update instantly.

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