use a hash if you have enough memory. 
my @list1;
my @list2;

my %t;
@t{@list2} = ();
for ( @list1 ) {
  print "$_ found" if exists $t{$_};
}

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Boris

In reply to Re: comparing a string with lots of other strings by borisz
in thread comparing a string with lots of other strings by matthewsnape

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