[Bug libstdc++/58576] std::regex_match() reports mismatched braces on a valid regex

[galens at capaccess dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58576

Galen G Brownsmith <galens at capaccess dot org> changed:

           What    |Removed                     |Added
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  Attachment #30929|0                           |1
        is obsolete|                            |

--- Comment #1 from Galen G Brownsmith <galens at capaccess dot org> ---
Created attachment 30930
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30930&action=edit
re-uploading my tar.gz -- fixed an independent but potentially distracting
typo.

There was a case where part of the regex read "(?(?:" rather than "(?:(?:". 
Fixed that, behvior remains.