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Regex Tester — Free Online Test Tool

Regex Tester lets you test regex interactively with immediate feedback. Test regular expressions. It runs entirely in your browser, so nothing you enter is uploaded to a server. Free to use, with no signup and no watermark.

How to use Regex Tester

1. Set up your test input.
2. Run the test and watch the live result.
3. Adjust and repeat as needed.

Frequently asked questions

Does this need an internet connection?

Only to load the page. After that the testing itself runs locally in your browser.

Is there a limit on how much I can test?

No. Everything runs client-side, so there is no quota.

Can I use it on mobile?

Yes, though a larger screen is usually easier for detailed testing.

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