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Subject: Re: Emacs: adding 1 to every number made of 2 digits inside a marked
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>
> 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 is a typical job for a macro.  Move the cursor to the beginning of 
the first item of the list, then do:

C-x (
C-e
M-b
M-: (insert (format "%d" (1+ (number-at-point))))
C-k
C-a
C-n
C-x )

Then type C-x e e e ...