Validate only alphanumeric characters in Laravel

Question

I have the following code in my Laravel 5 app:

public function store(Request $request){
    $this->validate($request,          


        

Answer 1

Might be easiest to use the built in alpha-numeric validation:

https://laravel.com/docs/5.2/validation#rule-alpha-num

$validator = Validator::make($request->all(), [
    'filename' => 'alpha_num',
]);