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Re: Determining existence of text following point
From: |
Christopher Dimech |
Subject: |
Re: Determining existence of text following point |
Date: |
Tue, 18 May 2021 14:43:28 +0200 |
> Sent: Wednesday, May 19, 2021 at 12:27 AM
> From: tomas@tuxteam.de
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: help-gnu-emacs@gnu.org
> Subject: Re: Determining existence of text following point
>
> 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).
There is no problem, had misinterpreted "^" to mean beginning of line.
Thusly, everything seemed to be the other way round.
> Cheers
> - t
>
- Re: Determining existence of text following point, (continued)
- 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, 2021/05/18
- Re: Determining existence of text following point,
Christopher Dimech <=
- 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
- Re: Determining existence of text following point, michael-franzese, 2021/05/19