From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 6540 invoked by alias); 30 Sep 2013 03:06:08 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 6491 invoked by uid 48); 30 Sep 2013 03:06:04 -0000 From: "galens at capaccess dot org" To: gcc-bugs@gcc.gnu.org Subject: [Bug libstdc++/58576] New: std::regex_match() reports mismatched braces on a valid regex Date: Mon, 30 Sep 2013 03:06:00 -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: 4.8.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: galens at capaccess dot org 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: 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: 2013-09/txt/msg02012.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58576 Bug ID: 58576 Summary: std::regex_match() reports mismatched braces on a valid regex Product: gcc Version: 4.8.1 Status: UNCONFIRMED Severity: normal Priority: P3 Component: libstdc++ Assignee: unassigned at gcc dot gnu.org Reporter: galens at capaccess dot org Created attachment 30929 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30929&action=edit Archive containing the g++ -v -save-temps compile log, the generated .ii file and the original .cpp with the minimum-to-reproduce test case. I attempted to use a regex to validate qualified hostnames. However, when I used the regex from this thread ( http://stackoverflow.com/questions/1418423/the-hostname-regex ), with or without replacing the [0-9A-Za-z] with [:alnum:] (and properly escaping the backslashes), I get a regex_error exception thrown on std::regex_match() call, with a regex_constants::error_brack as the reported code(). Using: An unmodified copy of gcc 4.8.1 20130603 from the Fedora 19 primary repository (rpm ver: 4.8.1-1.fc19 ) (I use 4-spaces-per-tab in my source code, which isn't relevant for the code, but might make hand-tracing of Parens, Braces, and Brackets I did in comments more understandable.) (And, yes, I know replacing [0-9A-Za-z] with [:alnum:] isn't a legitimate change WRT domain name validity, unless I force a 'C' locale. It was just easier to read when hunting down this issue.)