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Would an activity diagram be the best way to express validation rules for an HTML form, using a whole bunch of decision nodes? I am not convinced that it is, but I can’t find a more appropriate one, nor can I find any examples of validation rules models online.
None – no one in their right mind would create a graphical representation of form validation rules. UML is not the same thing as engineering drawings, in spite of the best efforts of its proponents.
You’re doing it wrong if the effort required to create the UML diagrams for a system approaches that of actually developing the code. Better to have running code that you can actually unit test. The unit tests are better documentation than UML will ever be.
Don’t try to represent everything in UML.