Regex Tester Online Free - Test Regular Expressions Instantly

Test and debug regular expressions with our free online regex tester. Real-time matching, syntax highlighting, and match group extraction. Perfect for developers working with JavaScript, Python, PHP, and more.

Common Regex Patterns

• Email validation: ^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$
• Phone number: ^\d{3}-\d{3}-\d{4}$
• URL: https?://[\w.-]+(?:/[\w.-]*)*
• Date: \d{4}-\d{2}-\d{2}

Regex Flags Explained

• g (global) - Find all matches
• i (case-insensitive) - Ignore case
• m (multiline) - ^ and $ match line boundaries