use Data::Dumper;

sub tell_structure {
    (my $string = Dumper(shift)) =~ s/\$VAR1 = //;
    
    my %regexes = (
        qr/^\[\s*/ => 'array',
        qr/^\{\s*'\w*' => / => 'hash',
        qr/^'\w*',*\n/ => 'value',
    );
    my @result;
    my $regex = join "|", keys %regexes;
    
    OUTER: while ($string =~ /$regex/) {
        for my $regex (keys %regexes) {
            if ($string =~ s/$regex//s) {
                last OUTER if $regexes{$regex} eq 'value';
                push @result, $regexes{$regex};
                last;
            }
        }
    }
    return @result;
}