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Regex Tester
Write a regular expression and instantly see every match highlighted in your test string, along with capture groups. A fast regex tester and debugger that runs locally — great for validating patterns for email, dates, and more.
100% free · runs in your browser · nothing is uploaded.
Why use this tool
- 100% free, forever
- No sign-up or login
- Runs entirely in your browser
- Your files never leave your device
- Unlimited use, no watermarks
- Works on desktop and mobile
How to use Regex Tester
- 1
Enter your regex pattern and flags (like g, i, m).
- 2
Paste a test string.
- 3
See matches highlighted live, with capture groups listed.
Write a pattern and flags, then see every match highlighted in your test string, with capture groups listed.
Frequently asked questions
JavaScript (ECMAScript) regular expressions — the same engine that runs in browsers and Node.js.