#!/usr/bin/perl open (F1, ") { my $term=$_; chomp ($term); $terms{$term}=$term; } while () { my $item=$_; chomp ($item); $source{$item}=$item; foreach (keys %source) { if ($source=~m/($term{$term})/) { #do nothing } else { print $1."\n"; } } } close (F1); close (F2);