After fixing your lack of strictures, as suggested by moritz and Corion, you still have a problem. The first argument of grep is not a string to search for, rather, it should be an expression ( /$en/, for example).
You'll end up with something like:
open(ENG,"<en_1000") or die $!;
my @eng_dat=<ENG>;
close ENG;
my $en="EN-1000-0003-3";
my @data= grep /$en/,@eng_dat;
print @data;
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