The best regEx pattern I've found is the RFC2822 Email Validation:
[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?
Taken from: regexr.com/2rhq7
All the other regEx I've tested, mark the string email@email
as a positive, which is false.