On Thu, Sep 23, 2021 at 3:24 PM Stephen Berman <stephen.berman@gmx.net> wrote:
>
> On Thu, 23 Sep 2021 08:23:26 +0800 Hongyi Zhao <hongyi.zhao@gmail.com> wrote:
>
> > On Thu, Sep 23, 2021 at 3:50 AM Stephen Berman <stephen.berman@gmx.net> wrote:
> >>
> >> 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
> >> > --------------------
> [...]
> > This one does nothing:
> >
> > (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-number x))))))
>
> It works for me.  How exactly did you use it?

Mark set the following in scratch buffer:

some    34
word    30

M-: (while (re-search-forward "[[:digit:]]\\{2\\}" nil t) (let ((x
 (match-string 0))) (delete-backward-char 2) (insert (format "%d" (1+
 (string-to-number x)))))) RET

Please see the screenshot of the running results on my machine in the
attachment.

HZ