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sub isValidIP {
   return (shift =~ m/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ and (($1|$2|$3|$4)
+ < 256));
}

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   return (shift =~ m/^(\d+)\.(\d+)\.(\d+)\.(\d+)$/ and not (($1|$2|$3
+|$4) > 255));