Regex Tester
Type a regular expression and see matches highlighted in real time. No install, no login — your input is never sent to a server and everything runs inside your browser.
Features
- Pattern + flag toggles (g, i, m, s, u, y); invalid regex shows a clear error message
- Live highlight preview of matched parts
- Per-match details: index, capture groups, and named groups
- Replace mode — preview and copy results with
$1,$<name>substitution - Built-in cheat sheet of common patterns
