Work/Personal
ifs( !prop("Subject"), "", prop("Subject").test("Health|Personal Finances"), "Personal", "Work" )
Old Explanation
if(empty(prop("Subject")), "",
If Subject is empty, display nothing.
if(test(prop("Subject"), "Health|Personal Finances"), "Personal",
Otherwise if Subject contains either Health or Personal Finances, display Personal.
"Work"))
Otherwise display Work.
3+ Categories
ifs( !prop("Subject"), "", prop("Subject").test("One|Two|Three"), "Category 1", prop("Subject").test("Four|Five|Six"), "Category 2", prop("Subject").test("Seven|Eight|Nine|Ten"), "Category 3" )