Regex Tester

Test regular expressions with instant match highlighting and flag controls, right in your browser.

Pattern

Test text

Highlighted preview

Waiting for input...

Tips

Use flags: g (global), i (case-insensitive), m (multiline), s (dot matches newline), u (unicode).
Matches are highlighted; capture groups are listed below the preview.
All processing happens locally in your browser; no data is sent to a server.