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

[Hongyi Zhao]

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?

Regards
-- 
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province