[Bug 229925] [EXP-RUN] Disallow escaping ordinary characters in regex(3)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229925

            Bug ID: 229925
           Summary: [EXP-RUN] Disallow escaping ordinary characters in
                    regex(3)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Ports Framework
          Assignee: portmgr at FreeBSD.org
          Reporter: kevans at freebsd.org
                CC: ports-bugs at FreeBSD.org

Created attachment 195334
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=195334&action=edit
patch(1) to disallow escaping random bits

Hi,

Please do an exp-run with the attached patch to disallow escaping of arbitrary
ordinary characters in regex(3). This makes a smoother progression into the
future with GNU extensions where some ordinary characters are blessed with
special meaning. Only characters that actually have special meaning when
escaped are allowed.

This patch addresses some POSIX-declared implementation defined behavior.

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