SATE-EasyReceipt/app/Rules/PhoneNumber.php

<?php

namespace App\Rules;

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


    public function check($value) : bool
    {
        return preg_match("/^\d{10,11}$/", $value) !== 0;
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return '正しくありません';
    }
}