#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

use LWP::UserAgent;

my $url = 'http://wordpress.org/latest';

my $ua = 'LWP::UserAgent'->new;

if (my $header = $ua->head($url)) {
    my ($version)
        = $header->header('Content-Disposition') =~ /(\d+\.\d+(?:\.\d+)?)/;
    say $version;

} else {
    die "Can't retrieve the header from '$url'.\n";
}