Professional Regex Tester - Test Regular Expressions Online
Test and debug regular expressions with our comprehensive regex testing tool. Features real-time matching, syntax highlighting, and detailed match information with support for all JavaScript regex flags.
Regex Tester Features
- Real-time regex pattern testing and validation
- Support for all JavaScript regex flags (g, i, m, s, u, y)
- Visual match highlighting in test text
- Detailed match information including groups and positions
- Common regex pattern library for quick testing
- Comprehensive regex syntax reference
- Error handling and syntax validation
Regular Expression Use Cases
- Form validation (email, phone, URL validation)
- Text parsing and data extraction
- Search and replace operations
- Log file analysis and filtering
- Code syntax highlighting and parsing
- Data cleaning and normalization
- Web scraping and content extraction
Regex Best Practices
- Start simple and build complexity gradually
- Use non-capturing groups (?:...) when you don't need the capture
- Be specific with character classes instead of using .*
- Use anchors (^ and $) to ensure full string matching
- Test with edge cases and unexpected input
- Consider performance implications of complex patterns