Python too slow for real world

[Christian Tismer]

Robb Shecter wrote:
> 
> Roy Smith wrote:
> 
> > Paul Prescod <paul at prescod.net> wrote:
> > > It is a performance issue if you don't know that regexps are supposed to
> > > be compiled.
> >
> 
> Hi,
> 
> Sorry if this is obvious, but does the Regex class cache compilations?  I

It has. You can look at it simply by opening re.py .

> couldn't find any info on this.  If it was, it would support subject matter
> experts nicely, like someone else mentioned.  But even as a CS person, I like
> how the Java "ORO" Regex Library has automatic Least Recently Used caching.
> This lets application code be simpler, as well as making it easier to share
> compiled expressions much more easily between objects.

Python does what it can to compile and cache regexen.
It just looses a lot of time with postprocessing of
results, calls to the internal regex machine in pcre
and so on. This part of the regex system will be
coded in C as well in some future, which should
minimize the overhead.

ciao - chris

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