Developer Tools
Regex Tester
Test regular expressions in real-time
100% private. Your files and inputs never leave your device — everything runs locally in your browser.
How to Use Regex Tester
Test regular expressions in real-time. No signup, no uploads, no watermarks.
- 1
Paste your code, JSON, or data into the editor.
- 2
Pick the transformation or validation options.
- 3
Run it and inspect the results in real time.
- 4
Copy the output or download it as a file.
Why choose Regex Tester?
- No uploads — your files never leave your device.
- Free forever with no signup, no watermarks, and no limits.
- Works on any device with a modern browser — no installs.
- Fast, private, and built for getting the job done in seconds.
Frequently Asked Questions
What is a regex tester?▾
A playground for writing and testing regular expressions with real-time matches, flags, and a replace mode.
Does it explain the match?▾
Yes — matching groups are highlighted so you can see exactly what each part of the pattern captures.
Is the regex tester free?▾
Yes, and it works entirely in your browser.