for $find qw((1958 1959 1960 1961 1962 1963 1964)){
    $index = 0; # index is defined to go down the array of each year
    while (defined $bros->{$find}->[$index]->{$key}){
           if ($bros->{$find}->[$index]->{$key} =~ /$data/i){
           # since we found one, we push the brothers data structure and
           # year of graduation in to the results hash
           push (@res,{brother => $bros->{$find}->[$index], year => $find});
           } # end if
    $index++;
    } # end while
} # end find