Regex Tester
Build, test and share regex patterns — instant feedback for security work.
Flags
\b[A-Za-z0-9_%+-]+@[A-Za-z0-9-]+\[A-Za-z]{2,}\b
Suggestions
Test Input
Type or paste sample text to see matches highlighted in real time.
Preview
john.doe@example.com
attack@evil.test
Visit https://example.com or http://10.0.0.1:8080
Matches
2
Last index
21
About this tool: Build and test regex patterns with instant highlighting, export and share options, and friendly error messages for quick debugging.