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Re: [External] : Re: Regexp for matching control character, say, FORM FE


From: Emanuel Berg
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 06:14:33 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

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"...



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