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<?php
// 略
class RegisterController extends Controller
{
    // 略    
    protected function validator(array $data)
    {
        return Validator::make($data, [
            'name' => ['required', 'string', 'alpha_num', 'min:3', 'max:16', 'unique:users'], //-- この行を変更
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users'],
            'password' => ['required', 'string', 'min:8', 'confirmed'],
        ]);
    }
    // 略
}