Regex Tester
Test Regular Expressions directly in your browser. Instantly see matches and errors.
About The Regex Tester
Test regular expressions against strings directly in your browser. A free tool for developers to debug and validate regex patterns instantly.
Unlike many free tools online, Regex Tester runs entirely inside your browser instead of uploading your code and data to a remote server. That means faster results and complete privacy, whether you're debugging, formatting, or preparing data for an app on a laptop or a phone.
How to Use
- Open the Regex Tester tool — no sign-up or installation required.
- Enter your input or upload the required file using the tool above.
- Review the live result as it updates instantly in your browser.
- Copy, download, or export your result when you're happy with it.
Frequently Asked Questions
Is Regex Tester free to use?
Yes. Regex Tester is completely free, with no sign-up, no watermark, and no usage limits.
Is my data safe when I use Regex Tester?
Yes. Regex Tester runs entirely in your browser, so your code and data stay local on your device and are never uploaded to a server.
Can I use this tool for large files or datasets?
Yes, the tool is optimized to handle typical development workloads directly in your browser. Extremely large inputs may take a moment longer to process depending on your device.