Just to point out, while it is deprecated it is perfectly valid email:

foo(@)@baz.com

And I believe your regex will mark it as invalid. You have 2 options how to approach such data as this one:

• Strictly follow RFC2822 (but for example use flags to disallow some features like comments)
• Use HTML5 default regex, which is not correct, but at least it will match the same expectations as browser does

Otherwise it ends somewhere in between and can be a little bit confusing (ignoring fact that such long regex is very easy to abuse and force engine to do matching in O(n^2)).

EDIT:

Also it is hard to tell in your alphanumeric/alpha/etc. work within Unicode groups or not. Is string ٠ numeric or not? This character is U+0660 Arabic-Indic Digit Zero, so it is digit, but I think that You do not expected that.