About the Regex Tester

The Regex Tester is a free online tool that lets you test patterns live with match highlighting & groups — so you can format, convert and debug without installing anything. Everything runs locally in your browser, so it is fast, completely private, and works even when you are offline.

Whether you are a developer, tester or student, the Regex Tester gives you instant results with no installation, no account and no limits.

How to use the Regex Tester

  1. Paste or type your content into the input box on the left.
  2. Click the action button for what you need.
  3. Copy the result from the output box, or download it as a file.

Frequently asked questions

Is the Regex Tester free to use?

Yes. The Regex Tester is completely free with no sign-up, no usage limits and no watermarks. Use it as many times as you like.

Is my data safe and private?

Absolutely. The Regex Tester processes everything inside your browser — your input is never uploaded to any server, so your data stays 100% private.

Does this run completely offline?

Yes. All processing happens in your browser using JavaScript, so once the page has loaded you can keep using it with no internet connection — and none of your code or data is ever sent to a server.

Do I need to install anything or use it on mobile?

No installation needed. The Regex Tester works in any modern browser on desktop, tablet and mobile.

What does the Regex Tester do?

It helps you test patterns live with match highlighting & groups quickly and accurately, with a clean interface and one-click copy or download of the result.

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