redirect non www to www htaccess, Right code to use?

1.

 rewritecond %{http_host} ^nadlerzforum.com [nc]    
rewriterule ^(.*)$ http://www.nadlerzforum.com/$1 [r=301,nc]

Code (markup):

2.

 RewriteCond %{HTTP_HOST} !^www\.nadlerzforum\.com$    
RewriteRule (.*) http://www.nadlerzforum.com/$1 [R=301,L]

Code (markup):

3.

RewriteCond %{HTTP_HOST} !^www\.    
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

Code (markup):

4.

RewriteCond %{HTTP_HOST} ^nadlerzforum.com [NC]    
RewriteRule ^(.*)$ http://www.nadlerzforum.com/$1 [L,R=301]

Code (markup):

All of this 4 codes, works in my server.
I'm not good in apache thing, my question is.,,.
What is the best and right code to use?
Thanks!

 

First one is good to use:

rewritecond %{http_host} ^nadlerzforum.com [nc]
rewriterule ^(.*)$ http://www.nadlerzforum.com/$1 [r=301,nc]

However, others also works on your server but above format is most recommended by most of the webmasters. I also uses the same code on all of my websites

 

Thanks for the suggestion

 

Good explanation.Thanks for sharing.

 

Lately I'm using this code:

With \.com
What is the difference with the first code and the second one?

 

Your Welcome

 

Yes all of them are working fine on my server as well.!!

 

The first code says that if the requested URL start with nadlerzforum.com, redirect it to http://www.nadlerzforum.com and the second rule says that if URL nadlerzforum.com not starting with www. then redirect it to www version.

 

Then what is better to use?

all small letters: rewritecond... ?
Or with caps lock: RewriteCond... ?