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Re: Stack Overflow moderator “animuson”

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Date Wed, 10 Jul 2013 19:39:05 +1000
Subject Re: Stack Overflow moderator “animuson”
From Chris Angelico <rosuav@gmail.com>
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On Wed, Jul 10, 2013 at 7:01 PM, Mats Peterson <matsp999@aim.com> wrote:
> Chris Angelico <rosuav@gmail.com> wrote:
>> I know what regular expressions are. I've used them in Perl, PHP,
>> JavaScript, Python, C++, Pike, and numerous text editors (which may
>> have been backed by one of the above languages, or may have been
>> something else). Doesn't change the fact that I have no idea what the
>> significance is of your post.
>>
>> ChrisA
>
> You do? And you haven't noticed the inferior performance of regular
> expressions in Python compared to Perl? Then you obviously haven't
> used them a lot.

That would be correct. Why have I not used them all that much? Because
Python has way better ways of doing many things. Regexps are
notoriously hard to debug, largely because a nonmatching regex can't
give much information about _where_ it failed to match, and when I
parse strings, it's more often with (s)scanf notation instead - stuff
like this (Pike example as Python doesn't, afaik, have scanf support):

> data="Hello, world! I am number 42.";
> sscanf(data,"Hello, %s! I am number %d.",foo,x);
(3) Result: 2
> foo;
(4) Result: "world"
> x;
(5) Result: 42

Or a more complicated example:

sscanf(Stdio.File("/proc/meminfo")->read(),"%{%s: %d%*s\n%}",array data);
mapping meminfo=(mapping)data;

That builds up a mapping (Pike terminology for what Python calls a
dict) with the important information out of /proc/meminfo, something
like this:

([
  "MemTotal": 2026144,
  "MemFree": 627652,
  "Buffers": 183572,
  "Cached": 380724,
  ..... etc etc
])

So, no. I haven't figured out that Perl's regular expressions
outperform Python's or Pike's or SciTE's, because I simply don't need
them all that much. With sscanf, I can at least get a partial match,
which tells me where to look for the problem.

ChrisA

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Thread

Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 07:55 +0000
  Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 18:26 +1000
    Re: Stack Overflow moderator “animuson” Steven D'Aprano <steve@pearwood.info> - 2013-07-10 08:37 +0000
      Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 08:33 +0000
        Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 18:50 +1000
          Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 08:46 +0000
            Re: Stack Overflow moderator “animuson” Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-10 03:12 -0600
              Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 09:13 +0000
            Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 10:52 +0100
            Re: Stack Overflow moderator “animuson” Robert Kern <robert.kern@gmail.com> - 2013-07-10 12:08 +0100
            Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 12:15 +0100
            Re: Stack Overflow moderator “animuson” Skip Montanaro <skip@pobox.com> - 2013-07-10 06:52 -0500
            Re: Stack Overflow moder ator “animuson” Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-10 15:01 +0000
              Re: Stack Overflow moder ator “animuson” CM <cmpython@gmail.com> - 2013-07-11 00:36 -0700
          Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 08:50 +0000
            Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 19:10 +1000
    Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 08:32 +0000
      Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 18:46 +1000
        Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 08:43 +0000
          Re: Stack Overflow moderator “animuson” Michael Torrie <torriem@gmail.com> - 2013-07-10 22:20 -0600
      Re: Stack Overflow moderator “animuson” Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-10 03:00 -0600
    Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 08:42 +0000
      Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 19:02 +1000
        Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 09:01 +0000
          Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 19:39 +1000
            Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 12:22 +0000
              Re: Stack Overflow moderator “animuson” Michael Torrie <torriem@gmail.com> - 2013-07-10 22:26 -0600
      Re: Stack Overflow moderator “animuson” Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-10 03:06 -0600
        Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 09:03 +0000
          Re: Stack Overflow moderator “animuson” Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-07-10 13:14 +0200
            Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 12:01 +0000
              Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 13:13 +0100
          Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 12:19 +0100
          Re: StackOverflowmoderator “animuson” Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-10 16:03 +0000
  Re: Stack Overflow moderator “animuson” Steven D'Aprano <steve@pearwood.info> - 2013-07-10 09:00 +0000
    Re: Stack Overflow moderator “animuson” Steve Simmons <square.steve@gmail.com> - 2013-07-10 12:18 +0100
    Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 12:13 +0000
      Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-10 22:22 +1000
      Re: Stack Overflow moderator “animuson” Skip Montanaro <skip@pobox.com> - 2013-07-10 07:35 -0500
      Re: Stack Overflow moderator “animuson” Paul Scott <pscott209@gmail.com> - 2013-07-10 14:27 +0200
      Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 13:39 +0100
      Re: Stack Overflow moderator “animuson” Skip Montanaro <skip@pobox.com> - 2013-07-10 08:12 -0500
      Re: Stack Overflow moderator “animuson” memilanuk <memilanuk@gmail.com> - 2013-07-10 07:34 -0700
      Re: Stack Overflow moderator “animuson” alex23 <wuwei23@gmail.com> - 2013-07-11 12:04 +1000
    Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 16:54 +0100
      Re: Stack Overflow moderator “animuson” Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-10 17:15 +0000
        Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 18:53 +0100
          Re: Stack Overflow moderator “animuson” Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-10 23:28 +0000
    Re: Stack Overflow moderator “animuson” Ethan Furman <ethan@stoneleaf.us> - 2013-07-10 09:18 -0700
    Re: Stack Overflow moderator “animuson” Joel Goldstick <joel.goldstick@gmail.com> - 2013-07-10 12:32 -0400
    Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 18:55 +0100
    Re: Stack Overflow moderator “animuson” Antoine Pitrou <solipsis@pitrou.net> - 2013-07-18 08:54 +0000
    Re: Stack Overflow moderator “animuson” wxjmfauth@gmail.com - 2013-07-19 11:54 -0700
      Re: Stack Overflow moderator “animuson” Chris Angelico <rosuav@gmail.com> - 2013-07-20 08:35 +1000
      Re: Stack Overflow moderator “animuson” Dave Angel <davea@davea.name> - 2013-07-19 19:14 -0400
      Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-20 11:27 +0100
  Re: Stack Overflow moderator “animuson” Joshua Landau <joshua@landau.ws> - 2013-07-10 12:12 +0100
    Re: Stack Overflow moderator “animuson” Mats Peterson <matsp999@aim.com> - 2013-07-10 12:06 +0000
      Re: Stack Overflow moderator “animuson” Benedict Verheyen <benedict.verheyen@gmail.com> - 2013-07-10 13:53 +0000
        Re: Stack Overflow moderator “animuson” alex23 <wuwei23@gmail.com> - 2013-07-11 12:08 +1000
      Re: Stack Overflow moderator “animuson” Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-10 10:02 -0600
      Re: Stack Overflow bans Mats Peterson (was Re: Stack Overflow moderator “animuson”) Michael Torrie <torriem@gmail.com> - 2013-07-10 22:38 -0600
  Re: Stack Overflow moderator “animuson” Benedict Verheyen <benedict.verheyen@gmail.com> - 2013-07-10 11:56 +0000
  Re: Stack Overflow  bans Mats Peterson (was Re: ....) Terry Reedy <tjreedy@udel.edu> - 2013-07-10 14:52 -0400
  Re: Stack Overflow moderator “animuson” Antoon Pardon <antoon.pardon@rece.vub.ac.be> - 2013-07-11 11:36 +0200
  Re: Stack Overflow moderator “animuson” Jake Angulo <jake.angulo@gmail.com> - 2013-07-19 17:33 +1000
  Re: Stack Overflow moderator “animuson” Kevin Walzer <kw@codebykevin.com> - 2013-07-19 20:47 -0400

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