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Re: Determining existence of text following point
From: |
tomas |
Subject: |
Re: Determining existence of text following point |
Date: |
Tue, 18 May 2021 14:27:40 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, May 18, 2021 at 02:15:27PM +0200, Christopher Dimech wrote:
[...]
> string-match looks as though it returns the index of the last match because
>
> (setq sa (string-match "[^[:blank:]]" " A neutrino is a fermion"))
> (setq sb (not (string-match "[^[:blank:]]" " A neutrino is a fermion")))
>
> gives
>
> sa: 2
> sb: nil
Sorry. I still don't understand.
- You send string-match to find a non-blank character
It does find one. If you don't specify more, that
will be the first one, i.e. the "A".
- Thus the value is 2. This is your first result.
- You negate that in your second setup (not ...). By
convention, in Lisp, 'nil' is the false value, everything
else is considered 'true'. Thus, (not (...)) evaluates
to (not 2) evaluates to nil. This is your second result.
Now what /is/ your problem? Your posts are sometimes... inscrutable
(to me, at least).
Cheers
- t
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- Re: Determining existence of text following point, (continued)
- Re: Determining existence of text following point, Jean Louis, 2021/05/18
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point, tomas, 2021/05/18
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point, Jean Louis, 2021/05/18
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point, tomas, 2021/05/18
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point, tomas, 2021/05/18
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point,
tomas <=
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point, Jean Louis, 2021/05/18
- Re: Determining existence of text following point, Christopher Dimech, 2021/05/18
- Re: Determining existence of text following point, Jean Louis, 2021/05/18
- Re: Determining existence of text following point, michael-franzese, 2021/05/18
- Re: Determining existence of text following point, Jean Louis, 2021/05/18
- Re: Determining existence of text following point, Jean Louis, 2021/05/18
- Re: Determining existence of text following point, michael-franzese, 2021/05/19
- Re: Determining existence of text following point, michael-franzese, 2021/05/19
- Re: Determining existence of text following point, Jean Louis, 2021/05/19