1/* VERP address extractor.
2   Copyright (C) 2008-2021 Sergey Poznyakoff
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 3, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program.  If not, see <http://www.gnu.org/licenses/>. */
16
17module 'verp'.
18#pragma regex push +extended
19
20func verp_extract_user(string email, string domain)
21  returns string
22do
23  if email matches "(.*)=%domain@.*"
24    string s \1
25    if s matches '.*\+([^\+]+)$' and validuser(\1)
26      return \1
27    elif s matches 'sentto-[0-9]{7}-[0-9]{4}-[0-9]{10}-(.*)$' and validuser(\1)
28      return \1
29    fi
30  fi
31  return ""
32done
33
34#pragma regex pop
35