You're not matching for the "/XX" part, and the second regex also matches whatever the first matches.

A relatively simple (and too permissive) regex would be: 

if ($qs =~ /^[a-zA-Z0-9][a-zA-Z0-9\.\-_]*(\/\d+)?$/) {
  # do stuff with $qs
}

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In reply to Re: Script to input IP Address and Subnet Bits (10.3.2.0/28) by Joost
in thread Script to input IP Address and Subnet Bits (10.3.2.0/28) by jesuashok

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