Like this? 
my %small_hash;
my @keys_to_keep = grep $config->{$_},@interesting_keys;
@small_hash{@keys_to_keep} = @$config{@keys_to_keep};
return \%small_hash;

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In reply to Re: Taking a subset of a hash by choroba
in thread [Answered!] Taking a subset of a hash by Narveson

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