That's a typo :).
What
diotalevi meant to write was
/[^[:print:]]/ and it means (as per `
perldoc perlre'):
C:\>perl -MYAPE::Regex::Explain -le"print YAPE::Regex::Explain->new(qr
+/[^[:print:]]/)->explain"
The regular expression:
(?-imsx:[^[:print:]])
matches as follows:
NODE EXPLANATION
----------------------------------------------------------------------
(?-imsx: group, but do not capture (case-sensitive)
(with ^ and $ matching normally) (with . not
matching \n) (matching whitespace and #
normally):
----------------------------------------------------------------------
[^[:print:]] any character except: alphanumeric,
punctuation, and whitespace characters
----------------------------------------------------------------------
) end of grouping
----------------------------------------------------------------------
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