/* Strip domain part from an email address.
   Copyright (C) 2006, 2007, 2008, 2009, 2010 Jan Rafaj

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>. */

module 'strip_domain_part'.
#pragma regex push +extended

func strip_domain_part(string domain, number n)
  returns string
do
  if n = 0
    return domainpart(domain)
  elif domainpart(domain) matches '.*((\.[^.]+){' . n . '})'
    return substring(\1, 1, -1)
  else
    return domain
  fi
done

#pragma regex pop