The paper presents a computable formulation of Hintikka semantics for clausal complements and partition semantics for questions in a framework where worlds are strings, propositions are regular sets of worlds, and epistemic acquaintance relations and question meanings are regular relations between worlds. A logical language is defined in a finite state calculus with function definitions, where terms denote regular sets of strings, interpreted as propositions. An interface to English syntax uses an extended categorial grammar.