#!/usr/bin/env perl
use strict;
use warnings;
use utf8;
use feature 'say';
use Benchmark qw(cmpthese);

say $];

my $pattern = '((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))';
my $regexp = qr/$pattern/;
my $ipv4 = '192.168.1.1';

cmpthese(0, +{
    'precompile' => sub {
        $ipv4 =~ $regexp;
    },
    'runtime' => sub {
        $ipv4 =~ /$pattern/;
    },
    'runtime_static' => sub {
        $ipv4 =~ /((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))/;
    },
});