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Re: Whittle it on down

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From Random832 <random832@fastmail.com>
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Subject Re: Whittle it on down
Date Thu, 05 May 2016 14:52:05 -0400
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On Thu, May 5, 2016, at 14:03, Steven D'Aprano wrote:
> You failed to anchor the string at the beginning and end of the string,
> an easy mistake to make, but that's the point.

I don't think anchoring is properly a concern of the regex itself -
.match is anchored implicitly at the beginning, and one could easily
imagine an API that implicitly anchors at the end - or you can simply
check that the match length == the string length.

> - Data validity doesn't matter, because there's no possible way that you
> might accidentally scrape data from the wrong part of a HTML file and end
> up with junk input.

If you've scraped data from the wrong part of the file, then nothing you
do to your regex can prevent the junk input from coincidentally matching
the input format.

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Thread

Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 00:58 -0400
  Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-04 22:39 -0700
    Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 08:44 -0400
    Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 19:31 -0400
      Re: Whittle it on down Peter Otten <__peter__@web.de> - 2016-05-06 09:45 +0200
        Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-06 09:58 -0400
          Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-06 10:41 -0400
            Re: Whittle it on down Peter Otten <__peter__@web.de> - 2016-05-06 17:44 +0200
              Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-06 18:43 -0400
      Re: Whittle it on down alister <alister.ware@ntlworld.com> - 2016-05-06 10:01 +0000
  Re: Whittle it on down Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-05 08:53 +0300
    Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 08:57 -0400
  Re: Whittle it on down Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-05-05 16:04 +1000
    Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-04 23:46 -0700
      Re: Whittle it on down Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-05-05 17:04 +1000
        Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-05 00:34 -0700
          Re: Whittle it on down Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-05-05 18:41 +1000
            Re: Whittle it on down Random832 <random832@fastmail.com> - 2016-05-05 09:13 -0400
              Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 03:13 +1000
      Re: Whittle it on down Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2016-05-05 17:36 +1000
        Re: Whittle it on down Peter Otten <__peter__@web.de> - 2016-05-05 10:17 +0200
          Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 01:39 +1000
        Re: Whittle it on down Random832 <random832@fastmail.com> - 2016-05-05 09:21 -0400
          Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 04:03 +1000
            Re: Whittle it on down Random832 <random832@fastmail.com> - 2016-05-05 14:52 -0400
            Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-05 12:09 -0700
        Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-05 06:32 -0700
          Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 10:36 -0400
          Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 03:43 +1000
            Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-05 11:55 -0700
        Re: Whittle it on down Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-05 20:49 +0300
          Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 04:14 +1000
            Re: Whittle it on down Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-05 21:27 +0300
              Re: Whittle it on down Random832 <random832@fastmail.com> - 2016-05-05 14:54 -0400
              Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 10:57 +1000
                Re: Whittle it on down Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-05-06 07:19 +0300
    Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 08:31 -0400
      Re: Whittle it on down Steven D'Aprano <steve@pearwood.info> - 2016-05-06 03:54 +1000
        Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 17:36 -0400
      Re: Whittle it on down Stephen Hansen <me+python@ixokai.io> - 2016-05-05 11:56 -0700
        Re: Whittle it on down DFS <nospam@dfs.com> - 2016-05-05 17:45 -0400

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