Regex Tester

Free online JavaScript regex tester. Live match highlighting, capture groups, flags, common patterns library. Test your regex instantly.

How to use the Regex Tester

1. Open the Regex Tester — it loads instantly in your browser, with no sign-up or install.
2. Enter your input by typing, pasting or uploading as the tool requires; results update automatically.
3. Copy or download the result. Nothing you enter leaves your device.

Frequently asked questions

Is the Regex Tester free?

Yes. The Regex Tester on UtilitySuite is completely free, with no account, sign-up or payment required.

Do I need to create an account?

No. Every UtilitySuite tool and game works instantly with no login or registration.

Does my data stay private?

Yes. The Regex Tester runs entirely in your browser — the text, numbers or files you enter are never uploaded to a server.

Which regex flavor does it use?

JavaScript regular expressions, with live match highlighting, capture groups and flag toggles.

Related developer tools

• JSON Formatter
• UUID Generator
• Password Generator
• JWT Decoder
• Base64 Encoder / Decoder

Browse all free online tools or play free browser games on UtilitySuite.