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From: Robert Jakob <rj@robertjakob.de>
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Subject: Re: [Caml-list] is there a way for turning strings to "format"s?

> My question is: is it possible to turn strings to values that would
> be accepted by Printf.printf as its first parameter?

You might be able to use Scanf.format_from_string:
http://caml.inria.fr/pub/docs/manual-ocaml/libref/Scanf.html#VALformat_from_string

r.