use strict;
use warnings;
use Tie::File;

my %seen;
tie my @file1, 'Tie::File', 'file.txt' or die;
tie my @file2, 'Tie::File', 'file2.txt' or die;

foreach (@file1) 
 { chomp; $seen{$_}++; }
 
for(@file2) {
    my $key = (split /\|/,$_)[1];
    print "$_\n" if $seen{$key};
}

untie(@file1);
untie(@file2);