Bell-Labs AWK does not support POSIX "bracket expressions" (POSIXese for "character classes", basically).  So change them to their character representation.
Bell-Labs AWK does not support POSIX "bracket expressions" (POSIXese for
"character classes", basically).  So change them to their character
representation.

Submitted by:	David Wolfskill <david@catwhisker.org>

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