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Re: Regular expression : non capturing groups are faster ?

From "Octavian Rasnita" <orasnita@gmail.com>
References <4f02e31c$0$15724$426a74cc@news.free.fr><mailman.4346.1325591848.27778.python-list@python.org><4f0315c6$0$10967$426a74cc@news.free.fr> <CABicbJLZvii2Z1e-xUuaNVdJOLGEg33doSJtmTB-S-nH-RtwiQ@mail.gmail.com>
Subject Re: Regular expression : non capturing groups are faster ?
Date 2012-01-03 22:07 +0200
Newsgroups comp.lang.python
Message-ID <mailman.4380.1325621415.27778.python-list@python.org> (permalink)

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From: "Devin Jeanpierre" <jeanpierreda@gmail.com>
Subject: Re: Regular expression : non capturing groups are faster ?


>> You meant Perl Documentation, didn't you ?
> 
> I guess that works too. I did mean Python, though -- its intent is to
> say "you shouldn't worry about this", but in the process it says "this
> does not exist" (a lie).


**
However, the Perl documentation doesn't lie.

I tested 10 million matches on my computer using capturing groups and it took ~ 6 seconds, but only ~ 2 seconds with non-capturing params.

So yes, it is very fast anyway, but ~ 3 times faster with non-capturing params, so there is a difference.

Octavian

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Regular expression : non capturing groups are faster ? candide <candide@free.invalid> - 2012-01-03 12:14 +0100
  Re: Regular expression : non capturing groups are faster ? Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-01-03 06:56 -0500
    Re: Regular expression : non capturing groups are faster ? candide <candide@free.invalid> - 2012-01-03 15:50 +0100
      Re: Regular expression : non capturing groups are faster ? Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-01-03 14:31 -0500
      Re: Regular expression : non capturing groups are faster ? "Octavian Rasnita" <orasnita@gmail.com> - 2012-01-03 22:07 +0200
      Re: Regular expression : non capturing groups are faster ? Devin Jeanpierre <jeanpierreda@gmail.com> - 2012-01-03 15:38 -0500
  Re: Regular expression : non capturing groups are faster ? "Octavian Rasnita" <orasnita@gmail.com> - 2012-01-03 13:59 +0200

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