Re: re Questions

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Date	Mon, 27 Jan 2014 04:25:29 +1100
Subject	Re: re Questions
From	Chris Angelico <rosuav@gmail.com>
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On Mon, Jan 27, 2014 at 4:15 AM, Roy Smith <roy@panix.com> wrote:
> In article <mailman.5996.1390756093.18130.python-list@python.org>,
>  Chris Angelico <rosuav@gmail.com> wrote:
>
>> The set [A-z] is equivalent to
>> [ABCDEFGHIJKLMNOPQRSTUVWXYZ[\\]^_`abcdefghijklmnopqrstuvwxyz]
>
> I'm inclined to suggest the regex compiler should issue a warning for
> this.
>
> I've never seen a character range other than A-Z, a-z, or 0-9.  Well, I
> suppose A-F or a-f if you're trying to match hex digits (and some
> variations on that for octal).  But, I can't imagine any example where
> somebody wrote A-z and it wasn't an error.

I've used a variety of character ranges, certainly more than the 4-5
you listed, but I agree that A-z is extremely likely to be an error.
However, I've sometimes used a regex (bytes mode) to find, say, all
the ASCII printable characters - [ -~] - and I wouldn't want that
precluded. It's a bit tricky trying to figure out which are likely to
be errors and which are not, so I'd be inclined to keep things as they
are. No warnings.

ChrisA

Thread

re Questions Blake Adams <blakesadams@gmail.com> - 2014-01-26 08:59 -0800
  Re: re Questions Larry Martell <larry.martell@gmail.com> - 2014-01-26 10:06 -0700
    Re: re Questions Blake Adams <blakesadams@gmail.com> - 2014-01-26 09:15 -0800
  Re: re Questions Chris Angelico <rosuav@gmail.com> - 2014-01-27 04:08 +1100
    Re: re Questions Roy Smith <roy@panix.com> - 2014-01-26 12:15 -0500
      Re: re Questions Chris Angelico <rosuav@gmail.com> - 2014-01-27 04:25 +1100
      Re: re Questions Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-26 17:39 +0000
      Re: re Questions Tim Chase <python.list@tim.thechases.com> - 2014-01-26 13:41 -0600
    Re: re Questions Blake Adams <blakesadams@gmail.com> - 2014-01-26 09:15 -0800
      Re: re Questions Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-01-26 17:30 +0000

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