[Bug c++/63775] New: [C++11] Regex range with leading dash (-) not working

["gnu-org at bignm dot com" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63775

            Bug ID: 63775
           Summary: [C++11] Regex range with leading dash (-) not working
           Product: gcc
           Version: 4.9.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gnu-org at bignm dot com

Created attachment 33918
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33918&action=edit
Source code of test program

Partial output from file below:

Note the String below should match the Regexp. Full source code of the test
program is attached below.

DEBUG: test_group(): String = 'module_method'
DEBUG: test_group(): Regexp = '/^([-a-z0-9]+)_([-a-z0-9]+)$/o'
DEBUG: group_regexp(): Using 'o' flag
DEBUG: group_regexp(): Match Failed!
DEBUG: test_group(): First match in 0.000753880 seconds
DEBUG: test_group(): First match failed!
DEBUG: group_regexp(): Using 'o' flag
DEBUG: group_regexp(): Match Failed!
DEBUG: test_group(): Second match in 0.000759125 seconds
DEBUG: test_group(): Second match failed!