From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-467688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 21178 invoked by alias); 20 Nov 2014 09:49:52 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 21153 invoked by uid 48); 20 Nov 2014 09:49:49 -0000
From: "kariya_mitsuru at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/63990] New: regex_search increments a past-the-end iterator
Date: Thu, 20 Nov 2014 09:49:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 5.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: minor
X-Bugzilla-Who: kariya_mitsuru at hotmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter attachments.created
Message-ID: <bug-63990-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2014-11/txt/msg02160.txt.bz2

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63990

            Bug ID: 63990
           Summary: regex_search increments a past-the-end iterator
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: minor
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kariya_mitsuru at hotmail dot com

Created attachment 34049
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=34049&action=edit
g++ -v

The sample code below is aborted with "attempt to increment a past-the-end
iterator".

=========================================================================
#include <regex>
#include <debug/string>

int main()
{
    __gnu_debug::string s = "a";
    std::regex_search(s.begin(), s.end(), std::regex("b"));
}
=========================================================================
cf. http://melpon.org/wandbox/permlink/2EesivDageAWjAnN


It seems that it always occurs if regex_search is not matched.
It also seems that such an iterator is never accessed.

cf. http://melpon.org/wandbox/permlink/PfGxfu5qjoqaDgEm


I think that it may not cause any problem.
But it is better to fix.