[Haskell-cafe] performance question

[David Thomas]

One way in which regexps are "foreign to Haskell-think" is that, if they
break, they generally break at run-time.  This could be ameliorated with
template haskell, but a substantial portion of Haskell coders find that a
smell itself.


On Wed, Feb 13, 2013 at 8:32 AM, Nicolas Bock <nicolasbock at gmail.com> wrote:

> Since I have very little experience with Haskell and am not used to
> Haskell-think yet, I don't quite understand your statement that regexes are
> seen as foreign to Haskell-think. Could you elaborate? What would a more
> "native" solution look like? From what I have learned so far, it seems to
> me that Haskell is a lot about clear, concise, and well structured code. I
> find regexes extremely compact and powerful, allowing for very concise
> code, which should fit the bill perfectly, or shouldn't it?
>
> Thanks,
>
> nick
>
>
>
> On Wed, Feb 13, 2013 at 8:12 AM, Brandon Allbery <allbery.b at gmail.com>wrote:
>
>> On Tue, Feb 12, 2013 at 11:32 PM, <briand at aracnet.com> wrote:
>>
>>> actualy native code compiler.  Can't regex be done effectively in
>>> haskell ?  Is it something that can't be done, or is it just such minimal
>>> effort to link to pcre that it's not worth the trouble ?
>>>
>>
>> PCRE is pretty heavily optimized.  POSIX regex engines generally rely on
>> vendor regex libraries which my not be well optimized; there is a native
>> Haskell implementation as well, but that one runs into a different issue,
>> namely a lack of interest (regexes are often seen as "foreign" to
>> Haskell-think, so there's little interest in making them work well; people
>> who *do* need them for some reason usually punt to pcre).
>>
>> --
>> brandon s allbery kf8nh                               sine nomine
>> associates
>> allbery.b at gmail.com
>> ballbery at sinenomine.net
>> unix, openafs, kerberos, infrastructure, xmonad
>> http://sinenomine.net
>>
>
>
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