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Probably a simple question, but: Is there any way to use wildcards in a resource policy when specifying the resource?  Or does that additional data need to come in as an attribute?

&gt; Probably a simple question, but: Is there any way to use wildcards in a resource policy when specifying the resource?
No, there isn’t. Principal policies support wildcards when specifying resources.

&gt; Or does that additional data need to come in as an attribute?
Yes, and then you can use regular expressions in conditions.