> > What doesn't work is sub-group matching, look ahead, etc -- things
> > requiring actions in the middle of a regexp (rather than at the
> > end).
> 
> Here is the second problem. You did exactly what was expected (taking
> a textbook on formal languages and implement what is said). The
> problem is that tools like PCRE, Lex, Yacc, etc. do not work as
> textbook say. They do not accept rational or context-free languages,
> they do not use DFA, NFA or LR(k) automata as claimed.
> 

Perhaps I should make my previous post (on the theoretic side of ocamllex)
a bit more precise.

The cited articles relate to << sub-group matching >> in DFA implementation
of regexp matching.

The proposed technique is an extension of the Dragon-Book technique
(Glukov ?)


--Luc

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