<?php namespace Rakit\Validation\Rules; use Rakit\Validation\Rule; class Alpha extends Rule { /** @var string */ protected $message = "The :attribute only allows alphabet characters"; /** * Check the $value is valid * * @param mixed $value * @return bool */ public function check($value): bool { return is_string($value) && preg_match('/^[\pL\pM]+$/u', $value); } }