Regex Tester
FreeWrite and test regular expressions with live match highlighting. No setup, no installs.
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- 1
Enter your regular expression in the pattern field and toggle flags as needed.
- 2
Paste or type your test string in the text area below.
- 3
All matches are highlighted instantly — the total count appears below the string.
Frequently asked questions
The tester supports g (global), i (case-insensitive), and m (multiline) flags.
Yes. It uses the native JavaScript RegExp engine which supports all modern regex features.
Completely. The regex tester runs entirely in your browser. Nothing is sent to any server.
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