$num gt "9"

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That made me blink for a second before I realized what was going on. Then I noticed you're missing the other half of the condition ($num lt "0").

You'd do better to check whether non-digits match in $num:

$num =~ /\D/

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This is self-documenting and complete.

Makeshifts last the longest.

In reply to Re^2: restart program on wrong user input. by Aristotle
in thread restart program on wrong user input. by BioGeek

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