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Re: Negative Lookahead Equivalent in emacs
From: |
luishenriquezperez |
Subject: |
Re: Negative Lookahead Equivalent in emacs |
Date: |
Wed, 10 May 2017 08:51:25 -0700 (PDT) |
User-agent: |
G2/1.0 |
On Tuesday, May 9, 2017 at 1:15:46 AM UTC-4, luishenri...@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.
I edited the solution slightly so no new lines are included.
\[^[:space:]\n\]\\(?:\[[:space:]\]\\|$\\)
There are a lot of backslashes because I used regex-builder to test it.
- 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, 2017/05/09
- 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 <=