Regex Tester
Write a regular expression and test it against sample text with live, highlighted matches, capture-group breakdowns and full control over flags.
Runs entirely in your browser — nothing is uploaded.
About Regex Tester
Write a regular expression and test it against sample text with live, highlighted matches, capture-group breakdowns and full control over flags.
- Live highlighting shows every match as you edit the pattern or text.
- Inspect capture groups and named groups for each match.
- Toggle global, ignore-case, multiline and other flags on the fly.
Regex Tester is part of Upwwards Tools, a free collection of browser-based utilities built by the team at Upwwards. Like the rest of the suite, it's free, requires no sign-up, and keeps your data on your device.
Frequently asked questions
What is Regex Tester?
Write a regular expression and test it against sample text with live, highlighted matches, capture-group breakdowns and full control over flags.
Is Regex Tester free to use?
Yes — Regex Tester is completely free with no sign-up, account or usage limits. It is part of the free Upwwards Tools collection built by Upwwards.
Is my data private when I use Regex Tester?
Regex Tester runs entirely in your browser. Everything you enter or upload is processed locally on your device and is never sent to a server, stored or logged.
Do I need to install anything to use Regex Tester?
No. Regex Tester works instantly in any modern web browser on desktop or mobile — there is nothing to download or install.