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Test Regular Expressions
Test and debug regular expressions with real-time matching. Our free regex tester highlights matches, shows capture groups, and supports all standard flags. Includes a library of common regex patterns.
How to Use This Calculator
- Enter your regex pattern
- Add test string
- Set flags (g, i, m, etc.)
- View highlighted matches
Features
- Real-time matching
- All standard flags
- Capture group display
- Common patterns library
- Match highlighting
Frequently Asked Questions
Is this Regex Tester free to use?
Yes, our Regex Tester is completely free to use with no registration or signup required. Use it as many times as you need.
How accurate is the Regex Tester?
Our calculator uses standard mathematical formulas and provides accurate results. For critical financial or health decisions, always consult with a qualified professional.
Does this tool work on mobile devices?
Yes, this tool is fully responsive and works on all devices including smartphones, tablets, and desktop computers.