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Re: Whittle it on down

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Subject Re: Whittle it on down
Date Thu, 05 May 2016 09:21:39 -0400
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On Thu, May 5, 2016, at 03:36, Steven D'Aprano wrote:
> Putting non-ASCII letters aside for the moment, how would you match these 
> specs as a regular expression?

Well, obviously *your* language (not the OP's), given the cases you
reject, is "one or more sequences of letters separated by
space*-ampersand-space*", and that is actually one of the easiest kinds
of regex to write: "[A-Z]+( *& *[A-Z]+)*".

However, your spec is wrong:

> - Leading or trailing spaces, or spaces not surrounding an ampersand,
> must not match: "AAA BBB" must be rejected.

The *very first* item in OP's list of good outputs is 'PHYSICAL FITNESS
CONSULTANTS & TRAINERS'.

If you want something that's extremely conservative (except for the
*very odd in context* choice of allowing arbitrary numbers of spaces -
why would you allow this but reject leading or trailing space?) and
accepts all of OP's input:

[A-Z]+(( *& *| +)[A-Z]+)*

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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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