Lab / Regex Tester

Regex Tester

Test regular expressions with live match highlighting, capture group visualization, and replacement preview.

Regex Testerbeta

Pattern

//g

Flags

Presets3 matches found

Test String

Contact us at support@example.com or sales@company.co.uk.
Invalid emails: @missing.com, no-at-sign.com
Another valid one: user.name+tag@domain.org

Match Results

#1support@example.com

Position: 14-33

#2sales@company.co.uk

Position: 37-56

#3user.name+tag@domain.org

Position: 122-146

Uses native JavaScript RegExp engine. All processing runs entirely in your browser — nothing is sent to a server.