Regex Tester
Test regular expressions with live match highlighting and detailed results.
Runs in your browserDeveloper
Test String
Highlighted
0 matchesThe quick brown fox jumps over the lazy dog. The dog barked back.
How It Works
1
Enter Pattern
Type your regular expression with optional flags.
2
Add Test String
Provide the text you want to test against.
3
See Matches
Matches are highlighted in real-time as you type.
4
Use Library
Browse the built-in pattern library for common expressions.
Key Features
🔍
Live Highlighting
See matches highlighted instantly as you type.
📚
Pattern Library
Built-in collection of common regex patterns.
🎯
Flag Support
Toggle global, case-insensitive, and multiline flags.
🔒
Private
Your test data never leaves your browser.
Use Cases
✦Validate email, phone, and URL patterns
✦Test regex before using in production code
✦Learn regular expressions with instant feedback
✦Extract data patterns from text