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Regex Tester — Live Regular Expression Matches

Test regular expressions in real-time

//
Flags
Replace mode

Matches

Enter a pattern and test string to see matches.
This tool runs on your device — your files and inputs never go anywhere.

How to Use Regex Tester

Test regular expressions in real-time No signup, and nothing gets uploaded for most use.

  1. 1

    Enter your regex pattern in the pattern field.

  2. 2

    Add the test text you want to match against.

  3. 3

    See matches highlighted with group breakdowns as you type.

  4. 4

    Test with flags like case-insensitive or global to refine the match.

Why you might like it

  • Nothing to upload — the work happens on your device.
  • Free with no signup, no watermarks, and no daily limits.
  • Works in any modern browser on any device — nothing to install.
  • Usually done in a few seconds, so it doesn't get in your way.
Try Regex

Frequently Asked Questions

What is a regex tester?▾

A playground for writing and testing regular expressions with real-time matches, flags, and a replace mode.

Does it explain the match?▾

Yes — matching groups are highlighted so you can see exactly what each part of the pattern captures.

Is the regex tester free?▾

Yes, and it works entirely in your browser.

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