Does this use the JavaScript regex engine?

Yes. The tool runs in the browser and uses the standard JavaScript (ECMAScript) regex engine.

Is my test data uploaded?

No. All matching is done on your machine.

Can I test capture groups?

Yes. The tool highlights and separates capture group matches.

Regex Tester

The Regex Tester gives you live feedback as you build and debug patterns. It highlights matches in your test text and supports flags like global and case-insensitive. It runs locally so your test data stays private.

Free · No limits · Runs in your browser

How to use

1Enter your regex pattern and set flags (g, i, m).
2Paste the text you want to search.
3See matches and capture groups highlighted in real time.

Frequently asked questions

Does this use the JavaScript regex engine?: Yes. The tool runs in the browser and uses the standard JavaScript (ECMAScript) regex engine.
Is my test data uploaded?: No. All matching is done on your machine.
Can I test capture groups?: Yes. The tool highlights and separates capture group matches.