Use: for testing against email regex
ref: http://codefool.tumblr.com/post/15288874550/list-of-valid-and-invalid-email-addresses


List of Valid Email Addresses

email@example.com
firstname.lastname@example.com
email@subdomain.example.com
firstname+lastname@example.com
email@123.123.123.123
email@[123.123.123.123]
"email"@example.com
1234567890@example.com
email@example-one.com
_______@example.com
email@example.name
email@example.museum
email@example.co.jp
firstname-lastname@example.com



List of Strange Valid Email Addresses

much.”more\ unusual”@example.com
very.unusual.”@”.unusual.com@example.com
very.”(),:;<>[]”.VERY.”very@\\ "very”.unusual@strange.example.com



List of Invalid Email Addresses

plainaddress
#@%^%#$@#$@#.com
@example.com
Joe Smith <email@example.com>
email.example.com
email@example@example.com
.email@example.com
email.@example.com
email..email@example.com
あいうえお@example.com
email@example.com (Joe Smith)
email@example
email@-example.com
email@example.web
email@111.222.333.44444
email@example..com
Abc..123@example.com



List of Strange Invalid Email Addresses

”(),:;<>[\]@example.com
just”not”right@example.com
this\ is"really"not\allowed@example.com