Greetings oh wise monks! I downloaded the whole of Wikipedia and i have built an index of every entry. I built the index with the following code

use strict;
use warnings;

open(WIKI, "<", "F:/wiki/enwiki-20130102-pages-articles.xml");
open(INDEX, "+<", "F:/wiki/wiki.index");

my $entry;
my $title;

while(<WIKI>){

    if( (index $_,"<title>") > -1 ){
        $title = $_;
        $title =~ s/.*?<title>//;
        $title =~ s/<\/title>.*?//;
        
        $entry = $title . "::" . $. . "\n";
        syswrite INDEX, $entry;
        
        print "line ", $. , " : $title  done\n";
    }
    
}

close(INDEX);
close(WIKI);
[download]

so each entry begins with line the title was found, "::", and then the title name. My question is how would i "jump" to a specific line without having to rifle through every line of the file. I am familiar with such things like Binary searches and would also like to implement search functionality (but that's not very relevant to the question)

any help would be appreciated.

update: The index just finished up and it ended up being almost half of a Gigabyte

update:Turns out i put the vars in the wrong places with the index code. no trubles. notepad++ has regexs