Regex Tester
Write a pattern, paste your text, see every match highlighted live β capture groups included. JavaScript regex engine, all local.
Matches (highlighted)
FAQ
Which regex flavor is this?
JavaScript (the RegExp your browser runs). Flags supported: g i m s u y d. Lookbehind and named groups work in modern browsers.
Is my text sent anywhere?
No β matching runs locally in your browser. Log lines, emails and other sensitive samples stay on your device.
Why does my pattern match "β "?
That's a zero-width match (e.g. \b or an optional group). They're shown as β markers so you can see where they fire without an infinite loop.