Core validation rules examples

In the cook book there are several examples of core validation rules
like:
var $validate = array(
'title' => array(
'rule' => 'notEmpty',
'message' => 'This field cannot be left blank'
)
);

However this seems to trigger a preg_match validation with
'notEmpty' (which is an invalid pattern). Tested with Cake 1.3.6.

The solution is to pass an array:
'rule' => array('notEmpty'),

Can anyone confirm this? - And if so, is it a bug in the code or in
the documentation?

Regards

Jonathan

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