Regex Tester

Test JavaScript regular expressions with live match highlighting and groups.

• Runs locally in your browser — no upload, no account

How to use Regex Tester

1. Type or paste your text, or open a file.
2. Choose the options you want.
3. Copy or download the result.

Frequently asked questions

Is Regex Tester free?

Yes. Regex Tester is free to use and needs no account or sign-up.

Is my data sent anywhere?

No. Everything you enter is processed inside your browser and is not sent to a server.

Does it work offline?

Once the page has loaded, processing needs no internet connection.

Does it work on phones?

Yes. It works in current mobile browsers on Android and iPhone, as well as on desktop.

Are there any limitations?

Uses the JavaScript regex engine; syntax differs slightly from PCRE and Python.

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