Regex Builder & Debugger
Build and test regular expressions with live match highlighting, capture groups, named groups, and a clickable cheatsheet.
Pattern
Flags
g: global, i: case-insensitive, m: multiline, s: dotAll, u: Unicode
Cheatsheet
Test String
Live Highlighting
Hello world! JavaScript regex is awesome. Email: demo@example.com
Matches
No matches found (or invalid regex).