What out the WHATWG's take on it: http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#e-mail-state-%28type=email%29 ht

What out the WHATWG's take on it: http://www.whatwg.org/specs/web-apps/current-work/multipage/states-of-the-type-attribute.html#e-mail-state-%28type=email%29 http://www.whatwg.org/specs/web-apps/current-work/multipage/... Specifically, they've redefined the format of email addresses in a way that's much simpler and is actually amenable to regular expressions. "This requirement is a willful violation of RFC 5322, which defines a syntax for e-mail addresses that is simultaneously too strict (before the "@" character), too vague (after the "@" character), and too lax (allowing comments, whitespace characters, and quoted strings in manners unfamiliar to most users) to be of practical use here." The spec even includes a Perl-compatible regex as an example. :)