[Bug 214783] [patch] awk(1) POSIX character classes never match backslash

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214783

            Bug ID: 214783
           Summary: [patch] awk(1) POSIX character classes never match
                    backslash
           Product: Base System
           Version: 10.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: martin at lispworks.com
          Keywords: patch

Created attachment 177332
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=177332&action=edit
Patch to escape chars in POSIX character classes

The commands below should print "yes" but on FreeBSD they print nothing:

echo '\' | awk '/[[:print:]]/ { print "yes" }'

The attached patch fixes this (and also a theoretical problem with matching
hyphen).

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