CakePHP 3.0 – 正则表达式验证

我需要根据正则表达式验证输入.

//Validator
 $validator
            ->notEmpty('sl_no')
            ->add('reg_no','validFormat',[
                    'rule' => '/^([ABCD]{2,2}[0-9]{4,4})$/i','message' => 'Please enter a valid serial number.'
            ]);

但是我收到以下错误：

Method /^([ABCD]{2,4})$/i does not exist.

此外,与Cake 2 Documentation不同,Cake 3.0 validation Documentation中没有提及正则表达式.

这被移动或修改了吗？

试试这个

$validator
        ->notEmpty('sl_no')
        ->add('reg_no',[
                'rule' => array('custom','/^([ABCD]{2,4})$/i'),'message' => 'Please enter a valid serial number.'
        ]);