Matches
Match details
Enter a regex pattern and test string to see results
About this tool
Write a pattern, paste test text, and see every match highlighted with its capture groups and indices — instant feedback instead of guess-and-rerun.
Use it to build validation patterns, log filters and parsers before they ship.
Patterns run with JavaScript (ECMAScript) regex semantics — the same engine as your frontend code.
Frequently asked questions
Which regex flavor is this?
JavaScript's — what runs in browsers and Node. Most patterns port directly to PCRE, but lookbehind and Unicode classes can differ in older engines.
What do the flags mean?
g finds all matches instead of the first, i ignores case, m makes ^ and $ match per line, s lets . match newlines.
Why does my pattern match nothing?
The most common causes: an unescaped special character (. + ? () []) or a missing g flag when expecting multiple matches.