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$ perl -MRegexp::Common=net -wle 'print $RE{net}{IPv4}'
(?:(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[
+0-1]?[0-9]{1,2})[.](?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.](?:25[0
+-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2}))

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#!/usr/bin/perl
use strict;
...
            Rate   class literal
class     3855/s      --    -99%
literal 712766/s  18390%      --