I don't think the first part of your regex will match the post url. I'm assuming the first match is alphanumeric. Also, this is an Apache RewriteRule so there won't be a $matches variable, just a regex placeholder.
function add_results_rewrite_rules() {
add_rewrite_rule(
'^([A-za-z\-]+)/your-result/([0-9]+$)/?$',
'index.php?name=$1&resultant=$2',
'top'
);
}