How to Use Free Online Regex Tester
Our free online regex tester provides instant pattern matching with real-time results right in your browser. Simply enter your regular expression, add test text, and see matches highlighted instantly. No signup required.
Key Features
- Real-time pattern testing with instant results
- Completely secure - all processing happens in your browser
- No signup or registration required
- Capture groups with detailed match information
- Extended flags support (verbose mode, anchored mode)
- Pattern history and example library
- Match highlighting and export functionality
- Quick reference guide built-in
Why Use This Tool?
Perfect for developers who need to test and debug regular expressions quickly. Save time with our real-time matching, comprehensive examples library, and detailed match analysis. Test patterns for email validation, URL extraction, phone numbers, and more.
Frequently Asked Questions
Is this regex tester free to use?
Yes, completely free with no limitations or signup requirements.
Is my data secure?
Absolutely. All processing happens locally in your browser. Your patterns and test strings never leave your device.
What regex flags are supported?
Standard JavaScript flags (g, i, m, s, u, y) plus extended flags for verbose mode (x) and anchored mode (A).
Does it work offline?
Yes, once loaded, it works completely offline.
Can I save my test patterns?
Yes, the tool automatically saves your recent tests to history (stored locally in your browser).
How accurate are the results?
Uses JavaScript's native RegExp engine, ensuring accurate and reliable results consistent with web standards.