Laravel Validation - Using wildcard (*) in the error message

'attributes' => [
    'product_rate_.*.*' => 'Product .*. / .*.',
],

What i try to do is using wildcard(*) as variable in error message.

It shows like

Product . * . / . * . area is required.

I want to see a message like that.

Product 1 / 2 area is required.

How can i assign the * characters to variables and using them like @index1 and @index2 ?

via Chebli Mohamed