How to recognize it's internal or external candidate in the autocomplete rule?

Summary:

How to recognize it's internal or external candidate in the autocomplete rule in the Offer?

Content (please ensure you mask any confidential information):

We have a business requirement to setup the autocomplete rule to validate the data being captured on the Offer.

The rule is different between internal and external candidate, how to recognize it's internal or external candidate in the autocomplete rule?

Which field is that?

Version (include the version you are using, if applicable):

24B

Code Snippet (add any code snippets that support your topic, if applicable):