Laravelでカスタムバリデーションを作成する方法

php artisan make:provider ValidatorServiceProvider

namespace App\Providers;

use Illuminate\Support\ServiceProvider;
use Domain\CustomValidator;

class ValidatorServiceProvider extends ServiceProvider
{
    /**
     * Bootstrap the application services.
     *
     * @return void
     */
    public function boot()
    {
      \Validator::resolver(function ($translator, $data, $rules, $messages) {
          return new CustomValidator($translator, $data, $rules, $messages);
      });
    }

    /**
     * Register the application services.
     *
     * @return void
     */
    public function register()
    {
        //
    }
}

'providers' => [
    ...

    App\Providers\ValidatorServiceProvider::class,

    ...

※カスタムバリデーションのメソッド名は、必ずvalidateXXXXという名前にする

<?php
namespace App;

class CustomValidator extends \Illuminate\Validation\Validator
{
    /**
    * なまえのバリデーション
    *
    * @param $attribute
    * @param $value
    * @param $parameters
    * @return bool
    */
    public function validateName($attribute, $value, $parameters)
    {
        if (preg_match('/[^a-Z]/u', $value) !== 0) {
          return false;
        }
        return true;
    }
}

resources/lang/ja/validation.php

'name' => 'The :attribute no valid name',
'attributes' => [
       ...

        'family_name_name' => 'ふりがな（せい）',

            $request->validate([
                'name' => 'required|Name',
            ]);