Regex Tester

Run a JavaScript regular expression against sample text and see every match with its groups.

How to use

Enter a pattern and any flags, paste the text you want to test, then press Test. The result lists every match with its character index and its numbered capture groups.

FAQ

Scanning always uses the global flag internally so you see every match, while your own flags such as i, m and s still apply. Matching stops after 200 results so a pathological pattern cannot lock the page.

Privacy: every calculation runs inside your browser. Your files and text never leave your device.