how to use required => true in multiple validation

Reading the doc there's explained that require isn't a "pure" rule, so
I'm asking how can I use it in multiple validation per field case:

example:
var $validate = array
(
'id' => array(
'idRule-1' => array(
'rule' => 'isUnique',
'message' => 'id is already registered.'
),
'idRule-1' => array(
'rule' => '/^[a-z0-9]{3}-([a-z0-9]{5}-){3}[a-z0-9]{4}$/',
'message' => 'Id field is not valid.'
),

)
)

How can I explain that ID field is required? where I can write this?

Second question: "allowEmpty => false" is stricter than "required =>
true"? My interpretation about allowEmpty => false is: field will be
required and empty is not allowed. Am I right? If this, I could use
allowEmpty in place of required.

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