Regex Tester
Test regular expressions with real-time matching and highlighting
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Enter a regex pattern and test string to see matches...
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About This Tool
Test and validate your regular expressions in real-time with our free regex tester. Perfect for developers who need to quickly test pattern matching, validate regex syntax, and see matches highlighted instantly.
Features
- Real-time regex testing with instant results
- Visual highlighting of matches
- Support for g (global), i (case insensitive), m (multiline), s (dotAll), u (unicode), y (sticky) and d (group indices) flags
- Details of every match with its capture groups and named groups
- Protection against expensive patterns (catastrophic backtracking): evaluation stops after 2 seconds without freezing the page
- Match counter showing total number of matches
- Detailed error messages for invalid regex patterns
Common Regex Patterns
\d+- Match one or more digits[a-zA-Z]+- Match one or more letters\w+@\w+\.\w+- Simple email pattern^\d{3}-\d{4}$- Phone number (XXX-XXXX)https?://[^\s]+- Match URLs
Regex Flags
- g (global): Find all matches instead of stopping after the first match
- i (case insensitive): Match both uppercase and lowercase letters
- m (multiline): ^ and $ match start/end of each line
- s (dotAll): . matches newline characters