Email Address
[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}
\b[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b
Email Address (Anchored)
^[A-Z0-9._%-]+@[A-Z0-9.-]+\.[A-Z]{2,4}$
Email Address without Consecutive Dots
\b[A-Z0-9._%-]+@(?:[A-Z0-9-]+\.)+[A-Z]{2,4}\b
Email Address on Specific Top Level Domains
^[A-Z0-9._%-]+@[A-Z0-9.-]+\.(?:[A-Z]{2}|com|org|net|biz|info|name|aero|biz|info|jobs|museum|name)$