Regex Tester

Test regular expressions against text with live match highlighting.

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How it works

Enter a pattern and flags, then type test text. Matches are highlighted live and counted. Everything runs in your browser.

Frequently asked questions

Is my data private?

Yes. The Regex Tester runs entirely in your browser. Nothing you enter is uploaded, saved to a server, or shared — it never leaves your device.

Is the Regex Tester free?

Yes, it is completely free with no sign-up, no limits and no watermarks. Like every tool on developer tools and the rest of the platform, you can use it as often as you like.

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