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m/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\$/;
use strict; my @nums; ... # test each for <= 255 here. # also make sure its not 0.0.0.0
m/^([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])\. ([01]?\d\d?|2[0-4]\d|25[0-5])\.([01]?\d\d?|2[0-4]\d|25[0-5])$/;
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