How to use
- Enter your regular expression in the provided input field.
- Enter the test string you want to match against.
- Click 'Test' to see live results of your regex pattern on the test string.
- Review the matching groups, highlighted matches, and any errors in your regex pattern.
- Refine your regex and retest until you're satisfied with the results.
Why use this tool?
completely free, forever
No sign-up required, no watermarks, and no daily limits.
Live Testing
See live results as you debug and refine your regular expression in real-time.
Detailed Match Information
View matching groups, highlighted matches, and error messages instantly.
Syntax Highlighting
Easily identify parts of your regular expression with syntax highlighting for clarity.
Error Detection
Catch and fix errors in your regular expression with immediate feedback.
All Devices Supported
Works on Windows, Mac, iPhone, iPad, and Android devices.
Frequently asked questions
Is the Regex Tester free?▼
How do I test my regular expression?▼
What is the benefit of live testing?▼
Can I use this tool for any regular expression?▼
Is my data secure when using this tool?▼
Which devices are supported?▼
About Regex Tester
Debug regular expressions live This free online tool runs entirely in your browser — no files are ever uploaded to our servers, ensuring your data stays private and secure. No registration, no watermarks, no limits.