Regex Tester

Test regular expressions against sample text and see matches.

Regular expression

Flags

Test string

What is Regex Tester?

Regex Tester is a free, browser-based tool that lets you convert or generate data with the regex tester in seconds — no software installs, no account, and no file size limits for typical use. Everything runs locally in your browser tab, so your content is never uploaded to a server, making it fast, private, and safe to use for work or personal projects.

How do I use the Regex Tester?

Type your regular expression and a test string.
Adjust any available options to match what you need.
Click the “Run” button and get your result instantly.
Copy or download the output — no sign-up required.

Frequently Asked Questions

Yes. Regex Tester is completely free, with no usage limits, watermarks, or sign-up required.

Yes. Regex Tester processes everything directly in your browser. Your files and text are never uploaded to a server, so nothing leaves your device.

No installation is needed. Regex Tester works instantly online in any modern web browser, on desktop or mobile.