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

From: Ovanes Markarian (om_boost_at_[hidden])
Date: 2007-10-30 14:06:55

Hello,

did you consider using xpressive? It is pretty powerfull. You could divide
static parts of regex(es) accross compilation units, so the compilation time
will decrease, but the linking time might increase. But anyway if you know
your expressions at compile time you will probably do better with xpressive.
Give it a try.

Best Regards,
Ovanes

On 10/30/07, Jacques-Olivier Goussard <jogoussard_at_[hidden]> 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 ?
> Note that I'm just foreseeing problems here - if you tell me there's no
> solution then
> I'll implement the expansion and see what the performance look like. Just
> trying here
> to code it right the 1st time :)
>
> On a side note:
> > regex under one locale and read back in under another, sadly bad things
> will
> > very likely happen :-(
>
> Not if you save the locale in the compiled version and throw if a mismatch
> occurs,
> but anyway I understand serializing is not an easy thing to do.
>
> Cheers
>       /jog
>
>
>
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