Regex Tester Tool
Test regular expressions against sample text with live match highlighting.
Test Text
Matches: 2
What Is the Regex Tester Tool?
The Regex Tester Tool is a free online tool that lets you test regular expressions against sample text with live match highlighting. It runs entirely in your browser — your text and files never leave your device, so it's fast and private. There's nothing to install and no sign-up required.
How It Works
Using the Regex Tester Tool takes seconds. Paste or type your content into the input area (or upload a file where supported), adjust any options to fit your needs, and the result updates instantly. You can then copy the output to your clipboard, download it, or clear everything and start again. Because all processing happens locally with JavaScript, it works offline once the page has loaded.
When to Use It
Reach for the Regex Tester Tool whenever you need a quick, reliable way to test regular expressions against sample text with live match highlighting. It's popular with writers, students, developers, marketers and anyone who works with code & data day to day. Bookmark it alongside the other Code & Data in our toolbox so it's always one click away.
Frequently Asked Questions
- Is the Regex Tester Tool free to use?
- Yes. Every tool on the site is completely free, with no account, login or download required.
- Is my data private?
- Absolutely. The Regex Tester Tool processes everything locally in your browser. Your text and files are never uploaded to a server, so your data stays on your device.
- Does it work on mobile?
- Yes. The Regex Tester Tool is fully responsive and works on phones, tablets and desktops in any modern browser.
- Do I need to install anything?
- No installation is needed — it runs in the browser. We also offer an optional browser extension and mobile app for quick access to popular conversions.
Last reviewed: 2026-06-27