KT-MyPage/app/Rules/LoginPassword.php

<?php

namespace App\Rules;

use App\Models\Htpms\MstCustomer;

class LoginPassword extends BaseRule
{

    private string $message = '';

    private int $min = 8;
    private int $max = 20;

    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
    }

    public function check($value): bool
    {
        if (!$this->length($value)) return false;
        if (!$this->charactor($value)) return false;
        return true;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return $this->message;
    }

    private function length(string $value)
    {
        $len =  strlen($value);
        if (8 <= $len  && $len <= 20) {
            return true;
        } else {
            $this->message = "{$this->min}文字以上 {$this->max}以下で設定してください";
            return false;
        }
    }

    private function charactor(string $value)
    {
        if (preg_match("/^[a-zA-Z0-9@.\-]+$/", $value) === 0) {
            $this->message = "半角英数字と記号(@.-)のみ設定可能です。";
            return false;
        }
        return true;
    }
}