парсим большой xml файл,перл

Значительно быстрее XML::Parser, XML::Simple, XML::LibXML и XML::DOM

#!perl
use strict;
my $xmlfile = shift || die "No filename at command line" ; die "Cannot find file \"$xmlfile\"" unless -f $xmlfile;
open(XML, "<", $xmlfile );
{
  local $/ = '</content>';
   while (<XML>) {

         while ( /<ip*>(.+?)<\/ip>/ig) {
           print "$1\n";
         }
         while ( /<ipSubnet*>(.+?)<\/ipSubnet>/ig) {
           print "$1\n";
         }

         print "\n";

     }
}

проверяем на гранях.ру:
- d:grani.ru ip:95.211.178.194 ip:166.78.44.193 ip:192.237.193.101 ip:166.78.40.126 ip:209.61.166.159 ip:209.61.166.246
ip:192.237.192.230 ip:209.61.166.64 ip:209.61.166.165 ip:209.61.166.4 ip:161.47.4.47 ip:23.253.121.44 ip:161.47.4.175
ip:161.47.4.248 ip:161.47.5.110 ip:161.47.5.166 ip:161.47.5.217 ip:162.242.141.164 ip:104.130.254.221 ip:104.239.245.140
ip:104.239.247.103 ip:172.99.100.79 ip:161.47.4.162 ip:174.143.186.112 ip:161.47.4.174 ip:66.216.67.114 ip:161.47.4.48
ip:161.47.5.142 ip:161.47.5.172 ip:161.47.5.163 ip:161.47.4.19 ip:174.143.186.218 ip:161.47.4.188 ip:209.61.166.43 ip:209.61.166.28
ip:162.209.66.206 ip:166.78.44.37 ip:66.216.109.184 ip:166.78.45.247 ip:161.47.4.80 ip:166.78.40.252 ip:161.47.5.183
ip:66.216.67.40 ip:104.239.245.37 ip:166.78.40.84 ip:161.47.7.59 ip:104.130.254.249 ip:104.239.247.210 ip:172.99.100.95
ip:161.47.6.150 ip:166.78.40.123 ip:66.216.68.28 ip:161.47.5.39 ip:104.130.144.187 ip:148.62.2.165 ip:104.239.220.103
ip:161.47.16.237 ip:148.62.4.51 ip:161.47.17.78 ip:161.47.17.182 ip:148.62.5.136 ip:148.62.5.188 ip:161.47.17.228 ip:148.62.0.118
ip:148.62.0.187 ip:161.47.18.82 ip:161.47.18.142 ip:148.62.2.12 ip:148.62.2.77 ip:161.47.19.33 ip:148.62.3.24 ip:148.62.4.172
ip:161.47.20.221 ip:161.47.21.100 ip:148.62.2.178 ip:148.62.3.19 ip:148.62.4.105 ip:148.62.5.241 ip:161.47.16.178 ip:161.47.16.198
ip:161.47.19.60 ip:148.62.5.165 ip:161.47.19.123 ip:148.62.4.219 ip:161.47.20.22 ip:148.62.2.60 ip:161.47.20.84 ip:148.62.3.249
ip:161.47.21.126 ip:148.62.4.250 ip:161.47.16.10 ip:161.47.16.140
...
итд.