I am attempting to add validation to my request validator for a group of fields to make sure that the group of fields does not exceed a certain amount. Once a user submits their form, they can view it in pdf form and my objective is to make sure that the collection of `f_name`, `m_name` and `l_name` does not run into another group of text on the pdf (thus making it illegible). 

Essentially, I want something like this:

```
public function rules()
{
  return [
    'f_name' + 'm_name' + 'l_name' => 'max:50',
    ...
  ];
}

```

I have searched all over but the only questions I can find related are simply how to do validation. If anyone knows how to group values in validation or links to previously asked questions, please let me know. Thanks mates.