You are correct, sir. I had thought it was use POSIX that caused it to bark at me when I didn't have the doubled brackets (POSIX syntax [: :] belongs inside character classes in regex), but it seems that it will bark without it. In either case, it only barks for positive char classes like [:digit:], not for negated ones like [:^digit:].
Caution: Contents may have been coded under pressure.

In reply to Re^3: negating POSIX regexp classes doesn't work as expected by Roy Johnson
in thread negating POSIX regexp classes doesn't work as expected by cazz

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