Re: [Maxima-discuss] regex packages, was: Reading data from header

[Volker v. N. <vol...@gm...>]

When I looked at this yesterday I noticed that Dorai Sitaram had fully
revised the portable regex parser which is the file pregexp.lisp in
share/stringproc.

First I would like to replace the old pregexp.lisp by the new one and to
do some tests and to write the documentation for the Maxima interface
functions which are in share/stringproc/sregex.lisp.

Thereafter I will see how I can replace calls to nregex in src. Maybe I
need help at this point to identify and understand all calls to nregex.

The performance of pregexp.lisp will surely improve when it is compiled
in src.

I will keep you informed.

Volker van Nek

Am 18.10.2015 um 23:10 schrieb Robert Dodier:
> On 2015-10-18, Volker van Nek <vol...@gm...> wrote:
> 
>> In share/stringproc there is an alternative regex parser (portable regex
>> parser by Dorai Sitaram) with an interface at Maxima level.
>>
>> It works nicely but it appears to be quite slow.
> 
> Thanks for the reminder, I had forgotten about that. I suspect that
> sregex is strictly more powerful than nregex; I'd be surprised if nregex
> were any faster, but that is not a key point. Also it's helpful that
> there is a Maxima interface for sregex. Given all that, I'm in favor of
> moving sregex into src and nuking nregex. There are a few calls to
> nregex in src, but those would be easily replaced by sregex, I believe.
> 
>> When parsing RGBident with ibase:16 the parser wants hex-numbers
>> starting with an alphabet-character to be zero-prefixed,
> 
> Yes, good point. I forgot about that too.
> 
> best,
> 
> Robert Dodier
> 
> 
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