Regex Tester

Test and validate regular expressions with real-time matching, replacement, and detailed analysis for pattern development and debugging.

Regular Expression Tester

Enter your regex pattern and test string to see matches and replacements

//g

Common Regex Patterns

Ready-to-use patterns for common validation and extraction tasks

Email Address
Matches email addresses
\b[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Z|a-z]{2,}\b
Example: [email protected]
Phone Number (US)
Matches US phone numbers
\(?([0-9]{3})\)?[-. ]?([0-9]{3})[-. ]?([0-9]{4})
Example: (555) 123-4567
URL
Matches HTTP/HTTPS URLs
https?:\/\/(www\.)?[-a-zA-Z0-9@:%._\+~#=]{1,256}\.[a-zA-Z0-9()]{1,6}\b([-a-zA-Z0-9()@:%_\+.~#?&//=]*)
Example: https://www.example.com
IPv4 Address
Matches IPv4 addresses
\b(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b
Example: 192.168.1.1
Hexadecimal Color
Matches hex color codes
#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})
Example: #FF5733
Credit Card
Matches credit card numbers
\b(?:\d{4}[-\s]?){3}\d{4}\b
Example: 1234 5678 9012 3456
HTML Tag
Matches HTML tags
<\/?[a-z][a-z0-9]*[^<>]*>
Example: <div class="example">
Date (YYYY-MM-DD)
Matches ISO date format
\b\d{4}-\d{2}-\d{2}\b
Example: 2024-01-15

Regex Features

  • • Real-time pattern validation and testing
  • • Multiple flag support (global, case-insensitive, etc.)
  • • Capture group analysis and extraction
  • • Find and replace functionality
  • • Match position and length information
  • • Common pattern library for quick use

Use Cases

  • • Form validation and input sanitization
  • • Data extraction and parsing workflows
  • • Log file analysis and filtering
  • • Text processing and transformation
  • • Search and replace operations
  • • API response validation and parsing

Professional Regular Expression Testing and Pattern Development

Regular expression testing tools are essential for software development, data validation, and text processing workflows. Professional regex testers enable developers to validate patterns, debug matching issues, and optimize performance for form validation, data extraction, and content processing applications requiring precise pattern matching capabilities.

Development Applications:

  • Form validation and user input sanitization for web applications
  • Data extraction and parsing from APIs and structured documents
  • Log file analysis and error pattern detection in system monitoring
  • Text processing and content transformation for publishing workflows
  • Search functionality implementation with advanced pattern matching
  • Database query optimization and string manipulation operations

Professional Features:

  • Real-time pattern validation with detailed error reporting
  • Comprehensive flag support for different matching scenarios
  • Capture group analysis with position and content extraction
  • Find and replace functionality for text transformation workflows
  • Common pattern library for rapid development and prototyping
  • Copy-to-clipboard functionality for seamless development integration

This tool provides enterprise-grade regex testing with professional accuracy for developers, data engineers, and system administrators requiring reliable pattern matching and validation for application development and data processing.