Yet another rookie question replace-regexp

Yet another rookie question replace-regexp

[billy]

I know how to use this on a whole file. but how can I make this work on
a region?
If I want to comment out a 50 lines of 10k I don't want to comment out
each line one at a time.  I would like to do C-space bar them move
below the last line I want to effect, the do the replace-regexp.  But
his does the whole file.  I pass it  ^ / #

Re: Yet another rookie question replace-regexp

[Albert Reiner]

["billy" <bp1497@att.com>, 7 Mar 2006 07:09:46 -0800]:
> I know how to use this on a whole file. but how can I make this work on
> a region?

You can always narrow to the region (C-x n n), do the replacement, and
then widen again (C-x n w).

Albert.

Re: Yet another rookie question replace-regexp

[Hans-Christoph Wirth]

billy <bp1497@att.com> wrote:

>  If I want to comment out a 50 lines of 10k I don't want to comment out
>  each line one at a time.  I would like to do C-space bar them move
>  below the last line I want to effect, the do

M-x comment-region

Re: Yet another rookie question replace-regexp

[kgold]

The general problem with M-x comment-region is that it doesn't handle
lines with comments.  You get something like:

	/* int i;   /* comment */*/

Personally, I like #if 0 for commenting out large chunks, using this 
function.

; function to comment a region using #if 0

(defun if0-region (p1 p2)
   (interactive "r")
   (let* ()
   (goto-char p1)
   (beginning-of-line)

   (insert "#if 0\n")
   (goto-char (+ p2 +9))
   (beginning-of-line)
   (insert "#endif\n")))


Hans-Christoph Wirth wrote:
> billy <bp1497@att.com> wrote:
> 
> 
>> If I want to comment out a 50 lines of 10k I don't want to comment out
>> each line one at a time.  I would like to do C-space bar them move
>> below the last line I want to effect, the do
> 
> 
> M-x comment-region

Re: Yet another rookie question replace-regexp

[Stefan Monnier]

> The general problem with M-x comment-region is that it doesn't handle
> lines with comments.  You get something like:

> 	/* int i;   /* comment */*/

That was the case in Emacs-20 but was fixed in Emacs-21.


        Stefan

Re: Yet another rookie question replace-regexp

[Michael Cadilhac]

"billy" <bp1497@att.com> writes:

> I know how to use this on a whole file. but how can I make this work on
> a region?
> If I want to comment out a 50 lines of 10k I don't want to comment out
> each line one at a time.  I would like to do C-space bar them move
> below the last line I want to effect, the do the replace-regexp.  But
> his does the whole file.  I pass it  ^ / #

,----[ C-h f replace-string RET ]
| replace-string is an interactive compiled Lisp function in `replace.el'.
| (replace-string from-string to-string &optional delimited start end)
| 
| Replace occurrences of from-string with to-string.
| [...]
| In Transient Mark mode, if the mark is active, operate on the contents
| of the region.  Otherwise, operate from point to the end of the buffer.
| [...]
| 
| [back]
`----

  In other words, you just have to activate the Transient Mark while
  selecting your region.

  In Emacs CVS it's done temporarily by hitting C-space twice.

-- 
    Michael Cadilhac, a.k.a. Micha [mika] |
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