Francois Pottier, speaking of using a "Functional Unparsing" like 
approach (cps) to regexps writes:

> Yes, it would be very nice to use this approach for regexps. Unfortunately,
> Danvy's encoding relies on the fact that the format specification is *not*
> a string. So, it would be possible to devise something along these lines,
> but the good old regexp syntax would probably have to be dropped.

That is not necessarily a bad thing.  The classic string-based regexp
syntax has often been criticized for unreadability.  Scsh's SRE
sexp-based regexp syntax may be an improvement.  I imagine that
something using this a cps approach could be an improvement, since the
"Functional Unparsing" approach to printing seems to provide a
reasonable notation.
-- 
T. Kurt Bond, tkb@tkb.mpl.com

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