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Groups > comp.lang.python > #99509

Re: Screen scraper to get all 'a title' elements

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: Screen scraper to get all 'a title' elements
Date 2015-11-26 01:53 +0200
Organization A noiseless patient Spider
Message-ID <87y4dl3abt.fsf@elektro.pacujo.net> (permalink)
References (1 earlier) <mailman.96.1448484959.20593.python-list@python.org> <n35ckk$9q0$1@dont-email.me> <c1e43997-0da3-4b93-b9af-98a2568eff9d@googlegroups.com> <mailman.103.1448492791.20593.python-list@python.org> <n35h0v$stn$1@dont-email.me>

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Grobu <snailcoder@retrosite.invalid>:

> Sorry, I wasn't aware of regex being on the dark side :-)

No, regular expressions are great for many purposes. Parsing
context-free syntax isn't one of them.

See:

  <URL: https://en.wikipedia.org/wiki/Chomsky_hierarchy#The_hierarchy>

Most modern programming languages including HTML are context-free. Their
structure is too rich for regular expressions to capture.

Regular expressions can handle any regular language just fine. They are
commonly used to define the lexical tokens of a language.


Marko

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Thread

Screen scraper to get all 'a title' elements ryguy7272 <ryanshuell@gmail.com> - 2015-11-25 12:42 -0800
  Re: Screen scraper to get all 'a title' elements MRAB <python@mrabarnett.plus.com> - 2015-11-25 20:55 +0000
    Re: Screen scraper to get all 'a title' elements Grobu <snailcoder@retrosite.invalid> - 2015-11-25 23:30 +0100
      Re: Screen scraper to get all 'a title' elements ryguy7272 <ryanshuell@gmail.com> - 2015-11-25 14:48 -0800
        Re: Screen scraper to get all 'a title' elements Chris Angelico <rosuav@gmail.com> - 2015-11-26 10:06 +1100
          Re: Screen scraper to get all 'a title' elements Grobu <snailcoder@retrosite.invalid> - 2015-11-26 00:44 +0100
            Re: Screen scraper to get all 'a title' elements Marko Rauhamaa <marko@pacujo.net> - 2015-11-26 01:53 +0200
              Re: Screen scraper to get all 'a title' elements Chris Angelico <rosuav@gmail.com> - 2015-11-26 10:59 +1100
            Re: Screen scraper to get all 'a title' elements Chris Angelico <rosuav@gmail.com> - 2015-11-26 10:54 +1100
            Re: Screen scraper to get all 'a title' elements Grobu <snailcoder@retrosite.invalid> - 2015-11-26 02:05 +0100
        Re: Screen scraper to get all 'a title' elements Grobu <snailcoder@retrosite.invalid> - 2015-11-26 00:33 +0100
          Re: Screen scraper to get all 'a title' elements ryguy7272 <ryanshuell@gmail.com> - 2015-11-25 15:37 -0800
            Re: Screen scraper to get all 'a title' elements Chris Angelico <rosuav@gmail.com> - 2015-11-26 10:42 +1100
  Re: Screen scraper to get all 'a title' elements ryguy7272 <ryanshuell@gmail.com> - 2015-11-25 14:04 -0800
    Re: Screen scraper to get all 'a title' elements Chris Angelico <rosuav@gmail.com> - 2015-11-26 09:10 +1100
  Re: Screen scraper to get all 'a title' elements TP <wingusr@gmail.com> - 2015-11-25 17:15 -0800
  Re: Screen scraper to get all 'a title' elements Denis McMahon <denismfmcmahon@gmail.com> - 2015-11-26 14:49 +0000

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