Comparing files with regular expressions

Hello,

I'm a Perl uber-novice and I'm trying to compare two files in order to
exclude items listed on one file from the complete list on the other
file.  What I have so far prints out a third file listing everything
that matches the exclude file from the complete file (which I'm hoping
will be a duplicate of the exclude file) just so I can make sure that
the comparison script is working.  The files are lists of numbers
separated by newlines.  The exclude file has 333 numbers and the
complete file has 9000 numbers.

Here's what I have so far:

#!/usr/bin/perl
use strict;
use warnings;

open(ALL, "all.txt") or die $!;
open(EX, "exclude.txt") or die $!;
open(OUT,'>exTest.txt') or die $!;

my @[EMAIL PROTECTED]
 = <EX>;
my @[EMAIL PROTECTED]
 = <ALL>;

foreach $all (@[EMAIL PROTECTED]
){
   foreach $ex (@[EMAIL PROTECTED]
){
       if ($ex =~ /(^$all)/){
	print OUT $1;
       }
   }
}
close(ALL);
close(EX);
close(OUT);

I realize the nested foreach loops are ugly but I don't know enough to
navigate the filehandles, which as I understand, can only be assigned
to variables in their entirety as an array.  Any thoughts on how this
might be done?

Thanks!