Regex Tester
Test regular expressions with live match highlighting. See matches, groups, and replacements update as you type.
How to Use
- 1 Enter your expression or code
- 2 See live results and explanations as you type
- 3 Adjust and copy when satisfied
Why Use This Tool
Private & Secure
Your data never leaves your device. Everything is processed right in your browser — nothing is uploaded or stored on any server.
Lightning Fast
No waiting for uploads or server processing. Results appear instantly because all the work happens on your machine.
Free, No Sign-Up
Use this tool as many times as you want. No account required, no email, no limits — just open and go.
Developer Friendly
Built for developers who need quick, reliable tools without the clutter. Keyboard-friendly and paste-ready.
Frequently Asked Questions
Is Regex Tester free to use?
Yes, Regex Tester is completely free with no usage limits, no account required, and no ads. You can use it as many times as you need.
Is my data safe when using Regex Tester?
Absolutely. Regex Tester runs entirely in your browser. Your files and data are never uploaded to any server — everything is processed locally on your device.
Can I use Regex Tester for large files?
Yes. Regex Tester processes everything in your browser, so it handles most file sizes well. For extremely large datasets, performance depends on your device's available memory.
Does Regex Tester work offline?
Once the page is loaded, Regex Tester works without an internet connection since all processing happens locally in your browser.