<form method="POST" action="some_url">
  <input name="_method" type="hidden" value="PATCH">
  <input type="hidden" name="_token" value="{{ csrf_token() }}">
  <input name="job_title" type="text" value="{{isset($profile->job_title) ? $profile->job_title : old('job_title') }}" class="form-control">
  <button type="submit">Submit</button>
</form>

class ProfileRequest extends FormRequest {


    public function authorize()
    {
       return true;
    }


    public function rules()
    {
       return = [
           'job_title' => 'required|max:100',
       ];
    }


    protected function failedValidation(Validator $validator)
    {

       throw (new ValidationException($validator))
        ->errorBag($this->errorBag)
        ->redirectTo($this->getRedirectUrl());
    }
}