The regex listed there isn’t that much more complex. It’s basically a check for *@a*.* where * is some minimal whitelist of valid characters and a is an alphanumeric to start the domain name.
> This requirement is a willful violation of RFC 5322, which defines a syntax for email 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.
Personally, I say if it's good enough for Web browsers, it's probably good enough for your app.