Regex Tester

Test regular expressions with live highlighting and capture group extraction. Everything runs in your browser — nothing is sent to a server.

Features

• Live matching — See matches highlighted in real time as you type your pattern.
• Capture groups — View numbered and named capture groups for each match.
• Flags support — Toggle global (g), case-insensitive (i), multiline (m), and other flags.

Common Regex Patterns

• Email — [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}
• URL — https?://[^\s/$.?#].[^\s]*
• IP Address — \b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b
• Date (YYYY-MM-DD) — \d{4}-(?:0[1-9]|1[0-2])-(?:0[1-9]|[12]\d|3[01])

Privacy

This tool uses JavaScript’s built-in RegExp engine. Your patterns and test strings never leave your browser.