Live feedback
See every match update as you edit the expression or test text.
Developer tools / Text
Regex Tester
Build and debug JavaScript regular expressions with live matches, capture groups, flags, and replacement previews.
//gi
Evaluated locally
Test text2 matches
Matches
[email protected]Index 8[email protected]Index 31Replacement preview
Contact [email] or [email] for help.
Capture details
Inspect match indexes and numbered capture groups without manual debugging.
Replacement preview
Test replacements safely before using a regex in your code or editor.