FilterPanel. InteractiveSearchPattern - list of possible values
great question!
uhhhhhh I don't think there's a list though :)
I did some digging through our support DB and found the following info. I have not had a chance to test these to validate.

InteractiveSearchPattern can be set to the name of a filter to find, well, that specific filter (or a partial filter name to match multiple filters)
status:m is abbreviated from status:modified, and will return a list of all modified filters
datatable:MyTable should match all filters from a given data table
* should match all columns (unclear if this is regex matching or not)

I inquired about this to TIBCO support, so if there are any additional points to list I'll make sure to update the answer :)
Where can I find the list of all possible options/values I can assign to this property ?
So far I only found people using: "status:m"
filterPanel.InteractiveSearchPattern = "status:m"