Re: [Gnu-arch-users] [Patch] Underscores in 'make-archive' e-mail

[Robin Farine]

address@hidden wrote:

> So IMO it's pretty clear that the domain part of an e-mail address *does*
> have the restrictions that a DNS domain has.
>  

Ouch, naturally you are correct. Now I also looked at rfc2821 which 
better describes actual restrictions on Internet e-mail addresses. There 
are also some MUST and SHOULD restrictions on the local part. Assuming 
that we can drop the quoted string form and the nested comments, I 
propose the following python code as approximation of an e-mail address 
verifier (it prints the regexp which is a bit long to figure here).  
Also, the  domain literal form is not accepted but it does not make much 
sense in an Arch archive name, right?

Comments welcome.

Robin

#! /usr/bin/env python

import re, sys

alnum = "[0-9A-Za-z]"
alnumhyph = "[-0-9A-Za-z]"
label = alnum + "(" + alnumhyph + "*" + alnum + ")?"
domain = label + "(\." + label + ")*"

atext = "[-0-9A-Za-z!#$%&'*+/=?^_`{|}~]"
local = atext + "+" + "(\." + atext + "+" + ")*"
email = "^" + local + "@" + domain + "$"
print email

emailre = re.compile(email)

if emailre.match(sys.argv[1]):
   print "ok"
else:
   print "nope"