My htaccess with cakephp doensn't work - regex

Question

I got a problem with probably my .htaccess
I use the cakephp framework (2.0) and i use .htacces to redirect a non-www to a www Using this code:
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
The problem is now, when somebody clicks on the link http://mysite.nl/controller/view/E1 They go to http://www.mysite.nl/index.php
instead of http://www.mysite.nl/controller/view/E1 (with www)
And this while the rewrite works on mysite.nl to www.mysite.nl
Can somebody tell me what i do wrong? i have searched for different kind of rewrite rules but with no luck.
Full .htaccess file after comment:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>

Answer 1

Ordering of rules is very important in .htaccess. In general your 301s should appear before front controller rules that catch all the requests and change the request URI.
Try this code:
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
# add www rule
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
# cakephp front controller rule
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^(.*)$ index.php [QSA,L]
</IfModule>