Regex Tester & Builder
Test, debug, and build regular expressions (regex) patterns. Supports PCRE (PHP) syntax with live matching and replacement.
/\w+@\w+\.\w+/gi
✅ Matches Found ℹ️ No Matches ❌ Error
Regex Error
✅ Replacement Result ❌ Error
Made replacement(s)
📚 Common Regex Patterns
Example:
🎯 Regex Quick Reference
Character Classes:
\d- Digit [0-9]\w- Word [A-Za-z0-9_]\s- Whitespace.- Any character[abc]- a, b, or c
Quantifiers:
*- 0 or more+- 1 or more?- 0 or 1 (optional){n}- Exactly n times{n,m}- n to m times
Anchors & Groups:
^- Start of string$- End of string()- Capture group|- Alternation (OR)\b- Word boundary
💡 Pro Tip
Pro Tip: Start simple and build up. Use character classes [a-z] instead of wildcards when possible for better performance. Remember that .* is greedy - use .*? for non-greedy matching to avoid matching too much text.
About Regex Tester and Builder
The tool supports multiple regex flavors including JavaScript, PHP (PCRE), Python, and more. Access a library of common patterns for emails, URLs, phone numbers, dates, and other frequently-needed patterns.
Features include match highlighting, capture group extraction, replacement testing, and detailed error messages for invalid patterns. Perfect for learning regex, debugging complex patterns, and building extraction rules.
Key Features
Easy to Use
Simple and intuitive interface
Instant Results
Get results immediately
Privacy Focused
Your data stays secure
Mobile Friendly
Works on all devices
100% Free
No payment required
Unlimited Usage
Use as many times as needed
How to Use Regex Tester and Builder
- Input Data: Enter or upload your data
- Configure: Set your preferred options
- Process: Click process to get results
- Download: Download or copy your results
Common Use Cases
Education
Perfect for students and researchers
Quick Tasks
Fast solutions for everyday needs
Personal Projects
Use for personal tasks and projects
Professional Work
Ideal for business and professional use
Frequently Asked Questions
Is Regex Tester and Builder free to use?
Yes! Our Regex Tester and Builder is completely free with no hidden fees or registration required.
Do I need to create an account?
No account needed. Start using the tool immediately without any signup process.
Is my data safe?
Yes, all processing happens in your browser. Your data never leaves your device.
Can I use this on mobile?
Yes, Regex Tester and Builder works perfectly on smartphones, tablets, and desktop computers.
Are there any limitations?
No strict limitations. You can use the tool as many times as you need.
Related Tools
Ready to Use Regex Tester and Builder?
Start using this powerful tool now. It's fast, free, and secure!
Use Tool Now