Re: Emacs: adding 1 to every number made of 2 digits inside a marked region.

[Stephen Berman <stephen.berman@gmx.net>]

On Wed, 22 Sep 2021 22:28:28 +0800 Hongyi Zhao <hongyi.zhao@gmail.com> wrote:

> Today, I stumbled on this interesting discussion here [1]:
>
> --------------------
> Imagine I've got the following in a text file opened under Emacs:
>
> some    34
> word    30
> another 38
> thing   59
> to      39
> say     10
> here    47
>
> and I want to turn into this, adding 1 to every number made of 2 digits:
>
> some    35
> word    31
> another 39
> thing   60
> to      40
> say     11
> here    48
> --------------------
>
> I tried all the ELISP codes suggested there, and only found that the
> following one is valid:
>
> C-M-% \b[0-9][0-9]\b return \,(1+ \#&)
>
> The other two can't do the trick:
>
> First one:
>
> (defun add-1-to-2-digits (b e)
>   "add 1 to every 2 digit number in the region"
>   (interactive "r")
>   (goto-char b)
>   (while (re-search-forward "\\b[0-9][0-9]\\b" e t)
>     (replace-match (number-to-string (+ 1 (string-to-int (match-string 0)))))))
>
> Validating method:
>
> `M-:' input-the-above-code-here, RET, `M-x add-1-to-2-digits'.
>
> And the second:
>
> (while (re-search-forward "\\<[0-9][0-9]\\>" nil t) (let ((x
> (match-string 0))) (delete-backward-char 2) (insert (format "%d" (1+
> (string-to-int x))))))
>
> Validating method:
>
> `M-:' input-the-above-code-here, RET
>
> [1] https://stackoverflow.com/questions/2686593/emacs-adding-1-to-every-number-made-of-2-digits-inside-a-marked-region
>
> Any hints/comments/enhancements for these methods will be greatly appreciated?

`string-to-int' was made obsolete long ago and removed in Emacs 26 (see
NEWS.26); replace it with `string-to-number' in those code snippets and
they'll work.

Steve Berman