[Ironpython-users] running asciidoc

Jeff Hardy jdhardy at gmail.com
Fri Apr 18 12:33:49 CEST 2014

On Thu, Apr 17, 2014 at 11:32 PM, Pawel Jasinski
<pawel.jasinski at gmail.com> wrote:
> I think it is simple .net regex which is slower.
> I did the following:
> 1. Proved that asciidoc run under python (cygwin) evaluates the same regular
> expression as under ipy - there are no bugs which make ipy evaluate more REs
> 2. Captured the evaluated regular expressions in a form suitable for .net
> and python
> 3. Write trivial program in c# to evaluate captured REs. (6 seconds)
> 4. Write trivial program in python to evaluate captured REs (0.4s for
> python3.2 and 0.65s for python 2.7.5)
> I also got rid off ipy/c# quirks (extra named groups), to get functional
> equivalent and no conversion overhead - no change
> Number of captured REs is 46253.
> For this particular sample, cpython implementation if regular expression
> appears to be 12 times faster than .net implementation

Can you put the sample code in a gist? Maybe it's hitting a
pathological case in the .NET regex engine or something, because
that's a crazy difference.

- Jeff

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