[Bug 232565] Regex implementation should not accept + modifier after {N}

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232565

            Bug ID: 232565
           Summary: Regex implementation should not accept + modifier
                    after {N}
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: arichardson at FreeBSD.org

The macOS regex library rejects a regex like
"SHM_[A-Z]+[[:space:]]+[0-9]{6}+" since there is an additional + character
after the {N} group.

I believe this should not be accepted since there is already a quantifer after
the [0-9].

See also https://svnweb.freebsd.org/changeset/base/339635

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