]> > See an article by Francois Pottier at > http://caml.inria.fr/archives/200107/msg00187.html > for (almost direct) answer. Well, for my original question, consider the choice of regular expression compilation to be an arbitrary task. The only point is that it be computationally expensive. I have wanted the same thing in completely different contexts. Jeff Henrikson jehenrik> Hi, jehenrik> I would like to write a Camlp4 construct which causes its argument to jehenrik> only be evaluated once. Eg: jehenrik> ... jehenrik> ... jehenrik> ... jehenrik> ONCE Pcre.regexp "([0-9]+)" jehenrik> would be transformed to: jehenrik> let gensym000 = Pcre.regexp "([0-9]+)";; jehenrik> ... jehenrik> ... jehenrik> ... jehenrik> gensym000 ------------------- To unsubscribe, mail caml-list-request@inria.fr Archives: http://caml.inria.fr Bug reports: http://caml.inria.fr/bin/caml-bugs FAQ: http://caml.inria.fr/FAQ/ Beginner's list: http://groups.yahoo.com/group/ocaml_beginners