Test regular expressions against sample text with live match highlighting.
Keep going with what you just made.
/\b[A-Z][a-z]+\b/g
Ada Lovelace and Grace HopperMatch: Ada
Match: Lovelace
Match: Grace
Match: HopperLive match highlighting + capture groups
Sample output — your files never leave your device.
JavaScript's native RegExp engine — so results match what you'd get in a browser or Node.js. Patterns for PCRE (PHP) or other engines may behave differently on edge-case syntax.
Add groups with parentheses in your pattern — each match in the results lists its captured groups alongside the full match and its position in the text.
Any JavaScript flags — g (all matches), i (case-insensitive), m (multiline anchors), s (dot matches newlines), u (Unicode), y (sticky). The tester applies g automatically so every match is shown.
Regex flavours differ — features like lookbehind, named groups or \z exist in some engines and not others, or use different syntax. This tester reflects the JavaScript engine exactly.
Yes. Regex Tester is completely free on GenRise, with no limits, watermarks, or hidden paywalls.
No. Every GenRise tool works instantly in your browser — no account, email, or sign-up required.
No. Regex Tester runs entirely on-device using your browser, so your files are never uploaded or stored anywhere. All processing happens locally.
Regex Tester uses your browser's built-in capabilities — Canvas, WebAssembly, and File APIs — to process files locally. Test regular expressions against sample text with live match highlighting. Simply open the tool, select your file, and the result is generated instantly on your device.
Yes. Since Regex Tester processes everything in your browser, your files never leave your device. There is no server-side storage, no tracking of file contents, and no data collection.
Yes. Regex Tester works on any modern browser, including mobile devices. It is fully responsive and optimized for both desktop and mobile use.
GenRise Regex Tester evaluates your regular expression against sample text as you type — matches highlight live in the text, and every match lists its position and capture groups so you can verify the pattern is grabbing exactly what you intend. Set JavaScript-style flags (g, i, m, s, u…), see the match count, and get a clear error for invalid syntax. It uses the real JavaScript RegExp engine — what matches here is what matches in your code.
Regex Tester runs entirely in your browser. Anything you enter or upload is processed locally and never sent to a server. There is no account required, no tracking of your content, and no data collection.