in reply to Re^5: Illegal division by zero error
in thread Illegal division by zero error

Thank you. This seems to have solved it. I didn't realise that /^\s+$/ relied on their being 1 or more.

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Re^7: Illegal division by zero error
by poj (Abbot) on Feb 01, 2016 at 18:30 UTC
    OK, have a look at quantifiers in perlre
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