[Bug 195792] New: awk mishandles [[:cntrl:]]

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195792

            Bug ID: 195792
           Summary: awk mishandles [[:cntrl:]]
           Product: Base System
           Version: 9.1-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: eggert at cs.ucla.edu

Here's a shell session illustrating the problem:

$ export LC_ALL=C
$ export PATH=/usr/bin:/bin
$ echo x | awk '/[[:cntrl:]]/'
x

The output should be empty, but awk mistakenly acts as if "x" is a control
character.

This bug broke a script that we use in GNU Emacs development; please see:

http://lists.gnu.org/archive/html/emacs-devel/2014-12/msg00704.html

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