About This Regex Tester
Our free regex tester tool helps you test and debug regular expressions with real-time match highlighting and comprehensive results. Whether you're validating email patterns, extracting data from text, or learning regex syntax, this tool provides instant feedback with highlighted matches, captured groups, and detailed match information. Test your patterns with various flags and see exactly how they work. All processing happens in your browser for complete privacy.
Features
Real-time regex testing and matching
Visual match highlighting in yellow
Support for all regex flags (g, i, m, s, u)
Detailed match information with index positions
Captured groups display for each match
Match count badge
Common regex pattern examples
Quick-load example patterns
One-click pattern copying
Error detection for invalid patterns
Benefits
Fast and instant regex testing
Visual highlighting for easy debugging
Privacy-focused - no server uploads
Works completely offline
Free with unlimited testing
No registration required
Mobile-friendly interface
Learn regex with examples
Debug complex patterns easily
Perfect for developers and data analysts
Common Use Cases
Validating email addresses and URLs
Extracting phone numbers from text
Parsing log files and data
Finding IP addresses in strings
Matching dates and timestamps
Validating usernames and passwords
Searching for hex color codes
Testing data validation patterns
Learning regular expression syntax
Debugging complex regex patterns