Bye bye, fast compilation times

[aliak]

On Sunday, 11 February 2018 at 16:35:35 UTC, Adam D. Ruppe wrote:
> The isemail function isn't about validating email addresses. It 
> is just about recognizing something that looks like one. just 
> like isurl doesn't actually try to fetch the site to see if it 
> is broken, it just sees if it looks like one as a first step.

*valid email format... (is better? :) )

When someone says isurl checks if a string is a valid url, I 
don't think the general assumption is that it makes a network 
call to check if it is a resolvable url. (could be mistaken of 
course, but not to me at least). Isurl checks that the format is 
correct. Same for isemail. The isemail API and the docs all use 
the term valid as well.

Plus, to further see how hard it is to validate an email, these 
are apparently all erroneous results (granted wikipedia could be 
wrong as well):

import std.net.isemail, std.stdio;

void main() {
     isEmail("john.smith(comment)@example.com").valid.writeln; // 
is valid, prints false
     isEmail("user@[2001:DB8::1]").valid.writeln; // is valid, 
prints false
     isEmail(`" "@example.org`).valid.writeln; // not valid, 
prints true
     
isEmail(`"very.unusual. at .unusual.com"@example.com`).valid.writeln; // not valid, prints true
}