Why not just use a simple regex:
print $day, $/ if $day !~ /^0|6$/;
I made a common beginner mistake and I feel really ashamed about it.
Although above code will work on a single digit as it was demanded
representing a weekday field from localtime()
it is not logic as it says: don't match 0 at the beginning or don't match 6 at the end.
With nonmatching parens ( !~ /^(?:0|6)$/
) it will satisfy the logic, still matching nondigits though.
So it would've even been better written as !~ /0|6/
since the expected data is a single digit.
I'm so sorry!
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