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Re: How to grep for a string spanning multiple lines?


From: Jean Louis
Subject: Re: How to grep for a string spanning multiple lines?
Date: Sat, 26 Nov 2022 11:27:28 +0300
User-agent: Mutt/2.2.7+37 (a90f69b) (2022-09-02)

* Marcin Borkowski <mbork@mbork.pl> [2022-11-26 09:45]:
> Hi all,
> 
> assume I have a file (probably an Org mode one) with some stuff
> I archived from the 'net.  (I'm going to start to sue
> youtube-sub-extractor.el.)  Here is my problem: assume I remember that
> someone in some video said something, and I want to find that part.
> However, it turns out that it is split between two (or more) lines.
> 
> Traditional `grep' is not helpful in this situation.  Neither is
> isearch, nor swiper.  One idea would be to convert the subtitles to one
> long line (which is an option), but are there any other ways to search
> for a string spanning more than one line (and not knowing which words
> are separated by a space and which ones by a newline)?
> 
> Both Emacs-y and shell-y tools would be appreciated.

I was just searching for pattern here:

(define-skeleton with-tabulated-id
  "Helper skeleton for `tabulated-list-get-id'"
  nil
  "(defun " (skeleton-read "Function name: ") " (" (skeleton-read "Arguments: " 
"&optional id") ")
  \"\"
  (interactive)
  (when-tabulated-id \"" (skeleton-read "Table: ") "\"
     ))")

by using this method and `grep':

$ grep -Pazo 'with-tabulated-id.*\n.*Helper' rcd-cf.el
with-tabulated-id
  "Helper~/Programming/emacs-lisp

As advised here:
https://stackoverflow.com/questions/152708/how-can-i-search-for-a-multiline-pattern-in-a-file

So grep can find patterns across multiple lines.

-- 
Jean

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