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Re: [External] : Re: Regexp for matching control character, say, FORM FE
From: |
Hongyi Zhao |
Subject: |
Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.) |
Date: |
Thu, 22 Jul 2021 21:56:09 +0800 |
On Thu, Jul 22, 2021 at 12:14 PM Emanuel Berg via Users list for the
GNU Emacs text editor <help-gnu-emacs@gnu.org> wrote:
>
> Drew Adams wrote:
>
> >>>>> I want to know whether there are some similar regexp
> >>>>> patterns in Emacs as the ones used by grep, say, $'\014'
> >>>>> or $'\f'.
> >>>>
> >>>> (re-search-forward "\C-l")
> >>>
> >>> Yes, or (re-search-forward "[\f]")
> >>> or (re-search-forward "[\014]")
> >>
> >> What about
> >>
> >> (re-search-forward (kbd "C-l"))
> >
> > Sure. Which is the same as (re-search-forward "\f").
>
> So far, these works
>
> (re-search-forward "[\014]")
> (re-search-forward "[\f]")
> (re-search-forward "\C-l")
> (re-search-forward "\f")
> (re-search-forward (kbd "C-l"))
>
> It seems subexpressions at lines 1 and 2 evaluate to the same
> "[^L]", as does for their part lines 3, 4 and 5, and then it
> is "^L"...
I observed another strange phenomenon as described below.
Suppose I've the following content in scratch buffer:
(re-search-forward "\f")
^L
I put the point at the end of sexp line, and hit `C-j' to evaluate it.
I find that each time after the sexp has been evaluated successfully,
the `^L' line will be moved to the next line. See the screenshot in
the attachment, where I've evaluated the sexp 4 times.
Any hints for this behavior?
Regards,
HY
2021-07-22_21-55.png
Description: PNG image
- RE: [External] : Re: The `^L' appeared in built-in help., (continued)
- RE: [External] : Re: The `^L' appeared in built-in help., Drew Adams, 2021/07/21
- Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Hongyi Zhao, 2021/07/21
- RE: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Drew Adams, 2021/07/21
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Hongyi Zhao, 2021/07/21
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Emanuel Berg, 2021/07/21
- RE: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Drew Adams, 2021/07/21
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Emanuel Berg, 2021/07/21
- RE: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Drew Adams, 2021/07/21
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Emanuel Berg, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Hongyi Zhao, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.),
Hongyi Zhao <=
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), tomas, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Hongyi Zhao, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), tomas, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Hongyi Zhao, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED., Michael Heerdegen, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED., Hongyi Zhao, 2021/07/22
- RE: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Drew Adams, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), tomas, 2021/07/22
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), Emanuel Berg, 2021/07/31
- Re: [External] : Re: Regexp for matching control character, say, FORM FEED. (Was: Re: The `^L' appeared in built-in help.), tomas, 2021/07/22