$code     = reference to an array holding identifiers
$hashhash = reference to a hash

##</code><code>##

$hashhash = {
             'identifier' => {'score'       => 7,
                              'query_start' => 80,
                              'query_end'   => 1292,
                              'subj_start'  => 367,
                              'subj_end'    => 1563
                              'e_value'     => '5e-12',
                              'defline'     => 'description',
                              'taxon'       => 'Homo sapiens',
                             },
             'identifier' => {...}
            }

##</code><code>##

if ($hashhash->{$codes->[$x]}->{'defline'} =~ m/NP_/) {
   do_something;
}

##</code><code>##

Can't use string ("description") as an ARRAY ref while
        "strict refs" in use at /home/spitzem/wp/retr_standaloneblast_ABCGfam.pl line 589 (#1)
    (F) Only hard references are allowed by "strict refs".  Symbolic
    references are disallowed.  See perlref.