Hmm.. A small issue: Your code allows IP addresses that contain "255" in an octet, or "0" as the last octet, which isn't bad if you're trying to match subnets or broadcasts but won't work perfectly for hosts. Subtle, but how about: 
unless ($get
        && $get =~ /^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[1-9]{1,3}$/
        && !grep { $_ < 0 || $_ > 254 } split(/\./, $get) )
                { print "MYSTIFYING: invalid target specified\n"; exit
+(-1);}

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In reply to Re: RE: Matching an IP address by Clownburner
in thread Matching an IP address by bort13

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