Free Online Regex Tester
Test and debug regular expressions instantly — matches highlight live as you type, right in your browser.
Common patterns
Cheat sheet — click to insert
Why RegexCraft
- Live highlighting. Every match lights up the moment you type — no run button, no waiting.
- Capture groups decoded. See each match with its offset plus numbered and named groups broken out.
- Private by design. Your patterns and test text never leave this page — everything runs locally in your browser.
- Learn as you go. One-click common patterns and a token cheat sheet that inserts at your cursor.
FAQ
Is RegexCraft free?
Yes. RegexCraft is completely free to use, with no signup, no account and no usage limits.
Which regex flavor does it use?
JavaScript — the same regular expression engine built into your browser. Any pattern accepted by new RegExp(pattern, flags) works here, so what you test is what your code will see.
Does my pattern or test text leave my browser?
No. Everything runs 100% locally in your browser. Nothing is uploaded, stored or sent anywhere.
What flags are supported?
All JavaScript regex flags: g (global), i (ignore case), m (multiline), s (dotAll), u (unicode) and y (sticky). Toggle them with the flag chips above the test area.
Can I use it on mobile?
Yes. RegexCraft is fully responsive and works in any modern mobile browser.