The reality is that ’.’ IS allowed just before ‘@’;
You will find that using quotes in an email address will simply be rejected by the mail server;
As for the double dot in the domain, that’s a separate issue that shouldn’t really be handled by this regex.

I use mailinator.com and my own setup to do test cases. This tells me if the email address is valid or not as the RFC specification is not reliable enough.

Domain names can be checked using validation, you only need a basic check.

Look at the length of the regex i’ve provided, and the regex provided by regular-expressions.info, the length is ridiculous for such a simple task.

Remember, regex along CANNOT define a valid email address, there is no “ultimate” regex, you need to use other systems for validation.

Hope this helps.

(?:[a-z\d!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z\d!#$%&'*+/=?^_`{|}~-]+)*|”(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*”)@(?:(?:[a-z\d](?:[a-z\d-]*[a-z\d])?\.)+[a-z\d](?:[a-z\d-]*[a-z\d])?|\[(?:(?:25[0-5]|2[0-4][\d]|[01]?[\d][\d]?)\.){3}(?:25[0-5]|2[0-4][\d]|[01]?[\d][\d]?|[a-z\d-]*[a-z\d]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])

Found it at http://www.regular-expressions.info/email.html and replaced 0-9 with \d

test.@test.com (’.’ is not allowed just before ‘@’)
“test \”test\” test”@test.com (’\”‘ is allowed inside quotation)
test@test..test.com (’..’ is not allowed)

Anyone who disagrees - or who can solve this?

Thanx