Re: [Boost-users] REGEXP - Serializing regexp ?

From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2007-10-30 16:12:21

Yes. ;)

On 10/30/07, Jacques-Olivier Goussard <jogoussard_at_[hidden]> wrote:
>
> Thanks a lot, I'll take a look - it seems very promising.
> Does it support wchar_t ? Another requirement of mine I'm afraid :)
>         /jog
>
> On 10/30/07, Eric Niebler <eric_at_[hidden]> wrote:
> >
> >
> > Jacques-Olivier Goussard wrote:
> > > Thanks for taking the time to answer John.
> > >
> > >  > How desperate are you? Are there really that many regexes that
> > > loading them
> > >  > from their string representation is a problem?
> > >
> > > Well, not *that* desperate - I'm looking at the existing options for
> > now.
> > > The number of regexp is roughly 4000 currently but unconstrained a
> > priori
> > > and a lot of them are quite huge. Futhermore, the match is done for
> > all
> > > those regexps on a list of string that can contain around 1 million
> > strings
> > > (so recompilation each time of the regexp is likely to be a problem).
> > >
> > > The problem is the following: I'm supposed to implement a  match
> > > on general tokens, i.e. being able to code regexps that would
> > > contain tokens like:
> > > (CITY)
> > > where CITY is defined elsewhere as a list of possible cities.
> > > The only way I see to do this with boost-regexp is to translate those
> > > pseudo-regexp
> > > into ones containing
> > > (boston|chicago|.....)
> > > I.e. replace all references to generic tokens to their expanded value
> > -
> > > I'm afraid
> > > that will use too much mem (if all loaded) or too much time (if
> > > recompiled each time) -
> > > unless there is a way to refer to another regexp in a regexp ?
> >
> >
> > I'll second the suggestion to look into xpressive. With xpressive, you
> > can refer to one regex from another. And with the latest version (in the
> >
> > Boost Sandbox) you can put your list of cities into a symbol table and
> > get very fast look-up -- much better than just a bunch of alternates.
> >
> > You can read about xpressive's symbol tables here:
> >
> > http://boost-sandbox.sourceforge.net/libs/xpressive/doc/html/boost_xpressive/user_s_guide/symbol_tables_and_attributes.html
> >
> > HTH,
> >
> > --
> > Eric Niebler
> > Boost Consulting
> > www.boost-consulting.com
> > _______________________________________________
> > Boost-users mailing list
> > Boost-users_at_[hidden]
> > http://lists.boost.org/mailman/listinfo.cgi/boost-users
> >
>
>
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