Regex tester
Test a regular expression against text with live match highlighting and capture groups. Powered by the native engine.
Matches
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About this regex tester
Write a regular expression and see every match highlighted in your test text in real time, along with captured groups. It uses the browser’s native JavaScript regex engine, so behavior matches exactly what your JS/TS code will do — no surprises from a different flavor.
Flags
Toggle the standard JavaScript flags:
- g — global: find all matches, not just the first.
- i — case-insensitive.
- m — multiline:
^and$match at line breaks. - s — dotall:
.also matches newlines. - u — unicode mode.
How to use it
- Type your pattern (no slashes needed).
- Toggle the flags you want.
- Paste the text to test — matches highlight as you type, with a live count.
FAQ
Which regex syntax is this?
ECMAScript (JavaScript) regular expressions, the same as new RegExp() and String.prototype.match. Patterns that rely on PCRE-only features like recursion or possessive quantifiers won't apply.
Does it send my text anywhere?
No — matching runs entirely in your browser with the native regex engine.