Regex Tester

Test regular expressions in real-time with visual match highlighting. Free online tool for developers.

Features

• Real-time Matching - Instant results as you type
• Highlighting - Visual match indication
• Group Capture - View captured groups
• Flag Options - Support for g, i, m, s flags

Flags Explained

• g (global) - Find all matches
• i (ignoreCase) - Case-insensitive
• m (multiline) - Multiline mode
• s (dotAll) - . matches newlines

Common Patterns

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