A few things to help you out:
- Your code doesn't compile, because there is a semi-colon missing at the end of @array = $form =~ /[A-Z][a-z]?|\d+/ig
- You assign the result of getweight(), which is in list context, to a scalar. As a result, $weight just equals 6 (the number of elements in the array). If I were you, I'd skip the subroutine and array and make weight a hash directly from the get-go:
use feature 'say';
print "Enter a chemical formula: ";
chomp( my $form = <> );
my %weight = $form =~ /[A-Z][a-z]?|\d+/ig;
Enter a chemical formula: C12H22O11
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