1. `M-x replace-string`
2. `C-q C-j`
3. `RET`
4. `RET`

The trick is to quote the `C-j` with `C-q`, but otherwise replacing newlines is like replacing anything else.

With my key bindings, which I think are standard, on windows:
 
 Select region

 shift-alt-%  

 ctrl-Q ctrl-J

 return

 return 

 !

Or to put it another way, query replace region, ctrl-q to get extended characters, ctrl-j to put in a newline, replace with nothing, all of them.

If you want to create a function to do this (and bind it to &lt;kbd&gt;F8&lt;/kbd&gt;) you could try:

&lt;!-- language: lang-lisp --&gt;

    (defun remove-newlines-in-region ()
      &quot;Removes all newlines in the region.&quot;
      (interactive)
      (save-restriction
        (narrow-to-region (point) (mark))
        (goto-char (point-min))
        (while (search-forward &quot;\n&quot; nil t) (replace-match &quot;&quot; nil t))))

    (global-set-key [f8] &#39;remove-newlines-in-region)

That&#39;s based on an example I that I [found here](http://xahlee.org/emacs/elisp_replace_string_region.html).

You might also consider the old standby `delete-blank-lines`, typically bound to &lt;kbd&gt;C-x C-o&lt;/kbd&gt;.

I have a C++ preprocessor written like this:

      #ifdef cpp_variable
	   //x+y;
      #endif

Can anyone tell me how to define this in Makefile.


How to define C++ preprocessor variable in Makefile

What is a first class citizen function?

Does Java supports first class citizen function?

*Edit:*  
As mention on [Wikepedia][1] 

&gt; First class functions are a necessity
&gt; for the functional programming style.

Is there any other use of first class functions?


  [1]: http://en.wikipedia.org/wiki/First-class_function

What is a first-class-citizen function?

How to remove all newlines from selected region in Emacs?

<p>How to remove all newlines from selected region in Emacs?</p>


I often want to unsplit window as follows:

    +--------------+-------------+			   +--------------+-------------+
    |              |             |			   |              |   	       	|
    |              |             |			   |              |   	       	|
    |              |             |			   |              |   	       	|
    +--------------+             |     --&gt;	   |              |   	       	|
    |              |             |			   |              |   	       	|
    |              |             |			   |              |            	|
    |              |             |			   |              |             |
    +--------------+-------------+			   +--------------+-------------+



    +--------------+--------------+			   +-----------------------------+
    |              |              |			   |                             |
    |              |              |			   |                             |
    |              |              |			   |                             |
    +--------------+--------------+    --&gt; 	   +-----------------------------+
    |                             |			   |                             |
    |                             |			   |                             |
    |                             |			   |                             |
    +-----------------------------+			   +-----------------------------+

Currently, I start with &lt;kbd&gt;ctrl&lt;/kbd&gt;-&lt;kbd&gt;x&lt;/kbd&gt; &lt;kbd&gt;1&lt;/kbd&gt; and then split vertically/horizontally. but my real qustion is how can one remove a particular window split with out disturbing the other window structure? Is there any elisp function in built?

emacs, unsplit a particular window split

Though I know how to set a global key-binding in Emacs, I find it hard to even Google out the code for a local (minor-mode specific) key-binding. For instance, I have this code in my `.emacs`:

    ;; PDFLaTeX from AucTeX
    (global-set-key (kbd &quot;C-c M-p&quot;)
    		(lambda ()
    		  (interactive)
    		  (shell-command (concat &quot;pdflatex &quot; buffer-file-name))))

I don&#39;t want to set it globally. Is there a function like `local-set-key`?

Set custom keybinding for specific Emacs mode

Is there a way to zoom in and out (dynamically change the font size, quite smoothly) on emacs?

emacs zoom in/zoom out

I&#39;d like to use emacsclient to edit emails in Mutt. 

I added this in .emacs

`(server-start)`

And in .muttrc I added

`set editor=&quot;emacsclient -nw %s&quot;`

It seems they work.
When I start a second Emacs, it complains there is already a server running so it issues errors. How to make sure to do `(server-start)` only if the server isn&#39;t already started?

Thanks

How to start emacs server only if it is not started?

When I modify a buffer, Emacs automatically creates a temporary symlink in the same directory as the file being edited (e.g. foo.c):

    .#foo.c -&gt; user@host.12345:1296583136

where &#39;12345&#39; is Emacs&#39; PID (I don&#39;t know what the last number means).

Why does Emacs create these links, and how do I prevent it from doing that?

Note that I have turned off auto save mode (`M-x auto-save-mode`) and disabled backup files (`M-x set-variable -&gt; make-backup-files -&gt; nil`). When I save a modified buffer, or undo the changes to it, the symlink disappears.

In particular, I&#39;m trying to prevent Emacs from creating these links because they cause the directory timestamp to be modified, which causes our build system to rebuild an entire module instead of compiling and linking for one changed file :/

Thanks for any input!

----------
Update: In order to prevent Emacs from creating interlocking files permanently, you can change `src/filelock.c` and build a custom binary:

    void
    lock_file (fn)
         Lisp_Object fn;
    {
         return;
         // Unused code below...
    }

----------
Update 2: Arne&#39;s answer is correct. It&#39;s now possible to disable lock files in the latest Emacs (24.3.1), by adding this to your .emacs file:

    (setq create-lockfiles nil)

Why does emacs create temporary symbolic links for modified files?

I have a simple vim problem that Google hasn&#39;t managed to help me with.  Any thoughts are appreciated.

I do the following search and replace:

    :s/numnodes/numnodes1/g

On a file containing the following text:

    numprocs=0  
    numnodes=0

I get 

    E486: Pattern not found

The position of the green square which indicates where I&#39;d start typing is clearly above the pattern.  I tried searching for other short phrases not involving regex, which are also present, which also fail.  A simple /numnodes highlights matches as expected.  Does anyone have any idea what might be the matter with vim?


vim does not find and replace simple phrase that is clearly present

I want to use `str_replace` or its similar alternative to replace some text in JavaScript.

    var text = &quot;this is some sample text that i want to replace&quot;;
    var new_text = replace_in_javascript(&quot;want&quot;, &quot;dont want&quot;, text);
    document.write(new_text);

should give 

    this is some sample text that i dont want to replace

&gt; If you are going to regex, what are the performance implications in
&gt; comparison to the built in replacement methods.

How can I perform a str_replace in JavaScript, replacing text in JavaScript?

I need to remove a substring of a string, but only when it is at the END of the string.

for example, removing &#39;string&#39; at the end of the following strings  :

    &quot;this is a test string&quot; -&gt;  &quot;this is a test &quot;
    &quot;this string is a test string&quot; - &gt; &quot;this string is a test &quot;
    &quot;this string is a test&quot; -&gt; &quot;this string is a test&quot;

Any idea&#39;s ? Probably some kind of preg_replace, but how??
 

Remove a part of a string, but only when it is at the end of the string

I have a string `&quot;MySites&quot;`. I want to place a space between `My` and `Sites`. 

How can I do this in jQuery or JavaScript?

Insert space before capital letters

I need some help on declaring a regex. My inputs are like the following:

```none
this is a paragraph with&lt;[1&gt; in between&lt;/[1&gt; and then there are cases ... where the&lt;[99&gt; number ranges from 1-100&lt;/[99&gt;. 
and there are many other lines in the txt files
with&lt;[3&gt; such tags &lt;/[3&gt;
```

The required output is:

```none
this is a paragraph with in between and then there are cases ... where the number ranges from 1-100. 
and there are many other lines in the txt files
with such tags
```

I&#39;ve tried this:

    #!/usr/bin/python
    import os, sys, re, glob
    for infile in glob.glob(os.path.join(os.getcwd(), &#39;*.txt&#39;)):
    	for line in reader: 
    		line2 = line.replace(&#39;&lt;[1&gt; &#39;, &#39;&#39;)
    		line = line2.replace(&#39;&lt;/[1&gt; &#39;, &#39;&#39;)
    		line2 = line.replace(&#39;&lt;[1&gt;&#39;, &#39;&#39;)
    		line = line2.replace(&#39;&lt;/[1&gt;&#39;, &#39;&#39;)
    		
    		print line

I&#39;ve also tried this (but it seems like I&#39;m using the wrong regex syntax):

    		line2 = line.replace(&#39;&lt;[*&gt; &#39;, &#39;&#39;)
    		line = line2.replace(&#39;&lt;/[*&gt; &#39;, &#39;&#39;)
    		line2 = line.replace(&#39;&lt;[*&gt;&#39;, &#39;&#39;)
    		line = line2.replace(&#39;&lt;/[*&gt;&#39;, &#39;&#39;)

I dont want to hard-code the `replace` from 1 to 99.

How to input a regex in string.replace?

It doesn&#39;t seem like it&#39;s possible to add a new line `/n` to an XML resource string. Is there another way of doing this?


String Resource new line /n not possible?

I want to replace all more than 2 white spaces in a string but not new lines, I have this regex: `\s{2,}` but it is also matching new lines.

How can I match 2 or more white spaces only and not new lines?

I&#39;m using c#

Regex to match more than 2 white spaces but not new line

    
    var i;
    for(i=10; i&gt;=0; i= i-1){
       var s;
       for(s=0; s&lt;i; s = s+1){
        document.write(&quot;*&quot;);
       }
       //i want this to print a new line
       /document.write(?);

    }

I am printing a pyramid of stars, I can&#39;t get the new line to print.

How do I create a new line in Javascript?

Greetings

When setting a summary for a property / field / method etc.. is it possible to have a newline in it?

    /// &lt;summary&gt;
    /// This is line 1
    /// This is line 2
    /// &lt;/summary&gt;
    public bool TestLine { get; set; }

When I set this it shows as on mouse over:

&gt;     bool TestLine
&gt;     This is line 1 This is line 2

But I want it to show as:

&gt;     bool TestLine
&gt;     This is line 1 
&gt;     This is line 2

I&#39;ve tried using `\n` but that doesn&#39;t work. Is there any way to get this done?



NewLine in object summary

Specifically I&#39;m interested in `istream&amp; getline ( istream&amp; is, string&amp; str );`. Is there an option to the ifstream constructor to tell it to convert all newline encodings to &#39;\n&#39; under the hood? I want to be able to call `getline` and have it gracefully handle all line endings.

**Update**: To clarify, I want to be able to write code that compiles almost anywhere, and will take input from almost anywhere. Including the rare files that have &#39;\r&#39; without &#39;\n&#39;. Minimizing inconvenience for any users of the software.

It&#39;s easy to workaround the issue, but I&#39;m still curious as to the right way, in the standard, to flexibly handle all text file formats.

`getline` reads in a full line, up to a &#39;\n&#39;, into a string. The &#39;\n&#39; is consumed from the stream, but getline doesn&#39;t include it in the string. That&#39;s fine so far, but there might be a &#39;\r&#39; just before the &#39;\n&#39; that gets included into the string.

There are [three types of line endings](http://en.wikipedia.org/wiki/CRLF#Representations) seen in text files:
&#39;\n&#39; is the conventional ending on Unix machines, &#39;\r&#39; was (I think) used on old Mac operating systems, and Windows uses a pair, &#39;\r&#39; following by &#39;\n&#39;.

The problem is that `getline` leaves the &#39;\r&#39; on the end of the string.

    ifstream f(&quot;a_text_file_of_unknown_origin&quot;);
    string line;
    getline(f, line);
    if(!f.fail()) { // a non-empty line was read
       // BUT, there might be an &#39;\r&#39; at the end now.
    }

**Edit** Thanks to Neil for pointing out that `f.good()` isn&#39;t what I wanted. `!f.fail()` is what I want.

I can remove it manually myself (see edit of this question), which is easy for the Windows text files. But I&#39;m worried that somebody will feed in a file containing only &#39;\r&#39;. In that case, I presume getline will consume the whole file, thinking that it is a single line!

.. and that&#39;s not even considering Unicode :-)

.. maybe Boost has a nice way to consume one line at a time from any text-file type?


**Edit** I&#39;m using this, to handle the Windows files, but I still feel I shouldn&#39;t have to! And this won&#39;t fork for the &#39;\r&#39;-only files.

    if(!line.empty() &amp;&amp; *line.rbegin() == &#39;\r&#39;) {
        line.erase( line.length()-1, 1);
    }

Content Type	Original Author	Original Content on Stackoverflow
Question	Sławosz	View Question on Stackoverflow
Solution 1 - Emacs	Bruce Stephens	View Answer on Stackoverflow
Solution 2 - Emacs	Pete	View Answer on Stackoverflow
Solution 3 - Emacs	Mark Longair	View Answer on Stackoverflow
Solution 4 - Emacs	Joseph Gay	View Answer on Stackoverflow

How to remove all newlines from selected region in Emacs?

Emacs Problem Overview

Emacs Solutions

Solution 1 - Emacs

Solution 2 - Emacs

Solution 3 - Emacs

Solution 4 - Emacs

What is a first-class-citizen function?

How to define C++ preprocessor variable in Makefile

Attributions