[Bug c++/57984] New: "terminate called after throwing an instance of 'std::regex_error' what(): regex_error" during regex object construction

[snypxy at yandex dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57984

            Bug ID: 57984
           Summary: "terminate called after throwing an instance of
                    'std::regex_error'   what():  regex_error" during
                    regex object construction
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: major
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: snypxy at yandex dot com

#include <regex>
#include <stdio.h>

int main(int argc, char* argv[]) {
        std::regex reg_identifier("([[:alpha:]]|_)+");

        bool is_match;

        is_match = std::regex_match("__my_var", reg_identifier);

        printf("%s\n", is_match? "Match" : "Not match");
        return 0;
}

outout:

terminate called after throwing an instance of 'std::regex_error'
  what():  regex_error