Hi dear monks!

I'm having problems in using a regexp and hashed hashes. I have the following variables:

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

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The hash has the following form:

$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' => {...}
            }

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My buggy code looks like this:

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

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$x is cycled from 0 to scalar(@{$code}); and I'm searching for 'NP_' in the defline. The code crashes with:

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.

[download]

I don't see any where I use the description-string as an ARRAY-reference. The problem is that some cycles work flawlessly, but then it crashes and I don't see any difference or reason what could explain this behaviour. Any hints are welcome, I'm just at the edge of knocking my head on the table... ;-)

Cheers, Micha

In reply to strict refs and REGEXP error by professa

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