Regex Tester
Test a regular expression against sample text and see every match, with captured groups, highlighted instantly.
0 matches
Matching runs entirely in your browser. Nothing is sent to a server.
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How to use this tool
- 1Enter a regular expression pattern.
- 2Set any flags you need (e.g. "gi" for global, case-insensitive).
- 3Paste your test string — matches and captured groups appear automatically.
Features
- Live matching as you type.
- Shows every match with its position and captured groups.
- Clear error message for an invalid pattern.
- No account or sign-up required.
Privacy
Your pattern and test string are matched entirely in your browser. Nothing is sent to a server.
Frequently asked questions
Is this regex tester free?
Yes, and there is no limit on how many times you can use it.
What regex flavor does it use?
JavaScript's built-in RegExp engine — the same one used in browsers and Node.js.
Why is there a limit of 1000 matches?
A pattern that matches an extremely large number of times (or matches on every position) could otherwise freeze the page — 1000 is enough to debug almost any real pattern.
Is my text sent to a server?
No. Matching happens locally in your browser.