Copyright 2008-2017 Horde LLC (http://www.horde.org/)
getBaseSubject() code adapted from imap-base-subject.c (Dovecot 1.2) Original code released under the LGPL-2.1 Copyright (c) 2002-2008 Timo Sirainen tss@iki.fi
See the enclosed file LICENSE for license information (LGPL). If you did not receive this file, see http://www.horde.org/licenses/lgpl21.
| Horde_Imap_Client_Data_BaseSubject | Determines the "base subject" of a string (RFC 5256 [2.1]). |