#!/usr/bin/perl

use strict;
use warnings;

open(FH, '< vhosts.conf');
my $content = do {local $/; <FH> };

my $start = q{<VirtualHost \*:80>};
my $finish = q{</VirtualHost>};
my @vhosts = $content =~ m!$start(.*?)$finish!sg;

foreach my $vhost (@vhosts) {
    my ($name) = $vhost =~ /ServerName\s(\S+)/;
    open(OUT, "> $name.conf") or die "Can't open outfile $name: $!\n";
    print OUT "<VirtualHost *:80>";
    print OUT $vhost;
    print OUT "</VirtualHost>";
    close(OUT);
}

1;