How about simply adding the $ anchor to your current regex? (5 or more digits and then the end of the string): 

    unless ($num =~ /^\d{5,}$/) {

# and more generally to combine a couple of conditions:

    unless ($num =~ /^\d{5,}/ and $num !~ /\D/) {

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In reply to Re: Regex Pattern Problem by danger
in thread Regex Pattern Problem by THRAK

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