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From: Eric Niebler (eric_at_[hidden])
Date: 2003-11-17 11:40:41

(Resending -- this bounced the first time)

Joel de Guzman wrote:

> Hartmut Kaiser <hartmutkaiser_at_[hidden]> wrote:
>> Eric Niebler wrote:
>>> xpressive will differ from Spirit in that it will have
>>> backtracking semantics. (Spirit has greedy semantics, and
>>> does not do backtracking.)
>> But Spirit does backtracking!
> I think Eric means: does not do exhaustive backtracking:
> *ch_p('a') >> ch_p('a');

Yes, that is what I meant.

Hartmut Kaiser wrote:
> How this does relate to the Spirit regex parser? Do you see any
> possibilities to combine these two?

The Spirit regex parser is built on top of Boost.Regex, which is
dynamically-bound; that is, you must specify a regex as a string to be
interpreted at runtime. xpressive will allow statically-bound regular
expressions. I see no possibilities to combine the two.

Hartmut Kaiser wrote:
> Please add me to your list of interested people, who wish to
> collaborate. I'm especially interested in a lexing component for Wave,
> which does not rely on Re2C, but is equally fast, but well integrated
> into the C++/STL idioms.

Excellent! This will be a good goal to work towards. If you could send
  me a list of the regular expressions Wave uses, I can work to make
sure xpressive can handle them.


Eric Niebler
Boost Consulting

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