Regular Expression Tester
Test and debug your regular expressions with real-time matching and detailed explanations.
Regular Expression Pattern
Test String
Matches
Quick Patterns
Email Address
Matches valid email addresses
Phone Number
Matches common phone number formats
URL
Matches web URLs with various protocols
Date
Matches common date formats
Password
Validates strong passwords
IPv4 Address
Matches valid IPv4 addresses
Features
Real-time Testing
Test your regex patterns instantly as you type with live results.
Match Highlighting
Visualize matches and capture groups with color highlighting.
Pattern Explanation
Get detailed explanations of what your regex pattern means.
Quick Patterns
Use pre-built patterns for common use cases.
Regex Testing & Debugging Tool
Advanced regular expression tester for developers and data professionals. Features include:
Key Features
- Real-time pattern matching with live input
- Syntax highlighting for regex components
- Detailed match explanations and groups
- Multi-language flavor support (PCRE, Python, JS)
- Interactive cheat sheet and reference
- Error detection with suggestions
- Match substitution preview
Why Use This Tool?
- Accelerate regex debugging process
- Learn regex syntax through examples
- Validate patterns before implementation
- Test across different regex engines
- Prevent catastrophic backtracking
FAQs
What regex flavors are supported?
Supports PCRE, JavaScript, Python, and .NET regex syntax.
Can I test complex lookaheads?
Yes, supports advanced features like lookaheads, lookbehinds, and atomic groups.
How to handle special characters?
Automatic escaping options available for regex-sensitive characters.
Is there a test corpus available?
Yes, includes sample text sets for common use cases.
Can I test case sensitivity?
Toggle case sensitivity flags (i modifier) directly in the interface.
Regex Best Practices
- Use non-capturing groups when possible
- Test with edge case inputs
- Properly escape special characters
- Use anchors (^$) for precise matching
- Keep complex patterns commented
Common Use Cases
- Data validation patterns
- Log file analysis
- Form input sanitization
- Text parsing and extraction
- Code refactoring assistance