[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: Negative Lookahead Equivalent in emacs
From: |
Wasell |
Subject: |
Re: Negative Lookahead Equivalent in emacs |
Date: |
Tue, 9 May 2017 11:54:27 +0200 |
User-agent: |
MicroPlanet-Gravity/3.0.4 |
On Mon, 8 May 2017 22:15:42 -0700 (PDT), in article <49e1dd7d-4be5-4b03-b9e2-
e26b15b0a6cb@googlegroups.com>, luishenriquezperez@gmail.com wrote:
>
> Hi,
>
> I'm trying to write a regex that matches the last character of a sequence of
> non-whitespace characters '[^\n\r\t\f ]', or an empty line matching ^$.
>
> Thus:
> Hello World! --> "o" and "!" would be matched
>
> In non-elisp regex languages I know the code for this is: \S(?!\S)
> I know that \S is equivalent too [^ /n/r/t/f].
> But I'm unsure of what the elisp equivalent (if any) of the negative
> lookahead (?!).
>
> I saw on this forum a post "gnu.emacs.help ? regex nirvana - near miss"
> Where Drew Adams said: "Typically, what you want to do for this in Emacs Lisp
> is to combine
> the use of a regexp for positive matching with other code that takes
> care of the non-matching (negation) need. "
>
> However, I'm not sure how to go about doing this.
If I'm not miss-understanding you completely, you want to match a non-
whitespace, followed either a whitespace or an end-of-line. That would be:
[^[:space:]]\(?:[[:space:]]\|$\)
Am I missing something?
- Negative Lookahead Equivalent in emacs, luishenriquezperez, 2017/05/09
- Re: Negative Lookahead Equivalent in emacs, Emanuel Berg, 2017/05/09
- Re: Negative Lookahead Equivalent in emacs, hector, 2017/05/09
- Re: Negative Lookahead Equivalent in emacs,
Wasell <=
- Re: Negative Lookahead Equivalent in emacs, Felix Dietrich, 2017/05/09
- Re: Negative Lookahead Equivalent in emacs, luishenriquezperez, 2017/05/09
- Re: Negative Lookahead Equivalent in emacs, luishenriquezperez, 2017/05/10