Re: A function to take the regexp-matched subsring directly

[daanturo <daanturo@gmail.com>]

On 30/10/2022 22:45, Philip Kaludercic wrote:
> Is there a reason you find yourself working with strings as opposed to
> buffers?  I've seen people try to force functional paradigms on Emacs
> when they do stuff like creating a list of lines in a buffer then
> iterating over these instead of using the (faster) buffer searching
> mechanisms.  My worry is that functions like these, while useful per se,
> might make more people inclined to write unideomatic and wasteful code.


In my case, strings are usually file names and shell command outputs


```elisp

;; Get the commit hash returned by git blame

(shell-command-to-string "git blame -L 1,1 -- README")

"19dcb237b5b (Eli Zaretskii 2022-01-01 02:45:51 -0500 1) Copyright (C) 2001-2022 Free Software Foundation, Inc.
"

;; parse:
(regexp-match "^[^ ]+"
"19dcb237b5b (Eli Zaretskii 2022-01-01 02:45:51 -0500 1) Copyright (C) 2001-2022 Free Software Foundation, Inc.
")
=> "19dcb237b5b"


;; From `vc-revision-other-window''s file name, find the original name and the revision
(regexp-match*
    "\\(.*?\\)\\(?:\\.~\\(.*?\\)~\\)?\\'"
    "/foo/bar.el.~main~")
    
=> ("/foo/bar.el.~main~" "/foo/bar.el" "main")

```


And many possible cases where the strings maybe buffer names or any not so long
strings that are not the size of a buffer.

-- 
Daanturo.