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Regex Tester

Advanced Regex Tester - Real-time Pattern Testing & Debugging

Professional regex tester with real-time matching, syntax highlighting, and detailed explanations. Test, debug, and learn regular expressions with our comprehensive tool. Perfect for developers, data validation, and text processing.

Real-time Testing
Syntax Highlighting
Pattern Library

Advanced Regex Tester

Regular Expression

//g
Flags:

Test Strings

No Match

Real-time Testing

See matches instantly as you type. No need to refresh or submit your regex pattern.

Visual Feedback

Highlighted matches and detailed explanations help you understand your patterns.

Pattern Library

Access common regex patterns for email, phone, URL validation and more.

🔒 Security & Privacy

• All regex processing happens locally in your browser

• No data is sent to our servers

• Your test strings and patterns remain completely private

• Open source and auditable code

Why Use Our Free Regex Tester?

Advanced Features

  • • Real-time regex matching and testing
  • • Syntax highlighting for better readability
  • • Multiple test strings support
  • • Detailed match visualization
  • • Regex explanation and breakdown
  • • Common patterns library

Perfect For

  • • Data validation and cleaning
  • • Text processing and parsing
  • • Form validation development
  • • Search and replace operations
  • • Learning regular expressions
  • • Code review and debugging

💡 Regex Best Practices

• Always test your regex with various input types

• Use non-capturing groups (?:) when possible

• Be specific with character classes [a-z] instead of .

• Use anchors ^ and $ for exact matching

• Consider performance with complex patterns

• Document your regex patterns for future reference

❓ Frequently Asked Questions

Is this regex tester free to use?

Yes, our regex tester is completely free to use. No registration or payment required.

What regex flavors are supported?

We support JavaScript regex syntax, which is compatible with most modern programming languages.

Can I save my regex patterns?

Yes! You can save patterns locally in your browser and export/import them as needed.

Does it work with complex regex patterns?

Absolutely! Our tester handles complex patterns including lookaheads, lookbehinds, and nested groups.

Can I test multiple strings at once?

Yes, you can add multiple test strings and see which ones match your regex pattern.

📝 Common Regex Patterns for Testing

Email Validation

^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$

Test: user@example.com

Phone Number

^\+?[\d\s\-\(\)]{10,}$

Test: +1 (555) 123-4567

URL Validation

^https?:\/\/[^\s\/$.?#].[^\s]*$

Test: https://example.com

Password Strength

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d@$!%*?&]{8,}$

Test: MyPass123!

⭐ Why Developers Choose Our Regex Tester

Real-time Testing

See matches instantly as you type. No need to refresh or submit.

Visual Feedback

Highlighted matches and detailed explanations help you understand patterns.

Privacy First

Your test data never leaves your browser. Complete privacy and security.

Learning Tool

Perfect for learning regex with explanations and common patterns library.