Validate验证类没有手机号验证

请查看源代码,每次提示手机号不正确??????????

+-------------------------------------------------------+
namespace app\index\validate;
use think\Validate;

// +----------------------------------------------------------+
// | 用户验证器 |
// +----------------------------------------------------------+
class User extends Validate
{
// 声明验证规则
protected $rule = [
'username' => 'require|length:2,100|unique:user',//唯一性后面加上表名
'password' => 'require|min:6',//最小后面带上数字
'repassword' => 'require|confirm:password',//确认后面带上与某个字段一致
'email' => 'email',
'mobile' => 'mobile'


];

// 声明提示消息
protected $message = [
'username.require' => '用户名必须填写',
'username.length' => '用户名长度非法(2-100位)',
'username.unique' => '用户名已占用,请重新输入',
'password.require' => '密码必须填写',
'password.min' => '密码最小长度为6位',
'repassword.require' => '请填入确认密码',
'repassword.confirm' => '两次输入的密码不一致',
'email.email' => '邮箱非法',
'mobile.mobile' => '手机号非法'

];



}