$rule public property
Definition of the validation rule, which should be used on array values. It should be specified in the same format as at \yii\validators\yii\base\Model::rules(), except it should not contain attribute list as the first element. For example:
['integer'] ['match', 'pattern' => '/[a-z]/is']
Please refer to \yii\validators\yii\base\Model::rules() for more details.
public array|yii\validators\Validator $rule = null
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