Regex Tester
Test and debug regular expressions in real time.
What is the Regex Tester?
Test and debug regular expressions in real time.
It runs 100% in your browser — your files never leave your device, no signup is required, and there are no usage limits or watermarks.
How to Use the Regex Tester
- Paste, drop, or type your input into the tool above.
- Adjust the options to match what you need.
- Preview the result before copying or downloading.
- Everything is generated on your device — nothing is uploaded.
Why Use Our Regex Tester?
- 100% private — files never leave your device.
- No signup, no email, no limits — completely free.
- Works on any device — desktop, tablet, mobile.
- No watermarks, no hidden fees.
Frequently Asked Questions
Is the Regex Tester free?
Yes — completely free with no signup, no email, and no usage limits.
Are my files uploaded to a server?
No. Everything runs in your browser using JavaScript. Your files never leave your device.
Do I need to install anything?
No — just open this page in any modern browser (Chrome, Firefox, Safari, Edge).
Does the Regex Tester work on mobile?
Yes, on iOS and Android browsers. Very large files are best handled on desktop.
Is there a file size limit?
No hard limits. Files under 100 MB work well on most devices.
Related Tools
Desktop Wallpaper Size
Find the correct wallpaper size for your desktop monitor ins...
Todo List
Simple todo list saved locally.
Email Signature Generator
Create a professional HTML email signature in your browser....
JSON to CSV
Convert JSON arrays to CSV format instantly.
Number to Words
Convert any number into words instantly.
Sample Log File Generator
Generate realistic sample log files instantly — Apache, Ngin...