Problem of remove 'index.php' with subdomain

[eluser]missiria[/eluser]
Hello every codeigniter,

I stared to develope with codeigniter is the awesome framework, But I have one problem and I was search to solve this problem of .htaccess with the code htaccess i found in the documentation :

Code:

RewriteEngine on
RewriteCond $1 !^(index\.php|images|robots\.txt)
RewriteRule ^(.*)$ index.php/$1 [L]

and I use the subdomain for my preprod web application.
but I cant solve it if you can help me plz?