Test a regular expression against text and see live matches.
Type a regular expression and a test string above to see every match highlighted in place, along with a table of match positions and capture groups. Toggle the flags — `g`, `i`, `m`, `s`, `u`, `y` — to change how the pattern behaves without rewriting it.
This uses the same JavaScript regular-expression engine your code runs, so what matches here matches in Node.js and the browser. Named groups and numbered groups are both shown, and everything runs locally — your pattern and text are never uploaded.
It uses the JavaScript (ECMAScript) engine built into your browser, the same one Node.js uses. Patterns behave identically to `new RegExp()` in your code, including named groups, lookahead, and lookbehind. It is not PCRE or Python `re`, so a few syntaxes differ.
The `g` (global) flag finds all matches instead of stopping at the first; `i` makes matching case-insensitive; and `m` (multiline) makes `^` and `$` match the start and end of each line rather than the whole string. You can combine them freely.