How to redirect www website to non-www website url using htaccess

DirectoryIndex index.html index.php
RewriteEngine on
RewriteCond %{HTTP_HOST} ^www\.(.+) [NC]
RewriteRule ^(.*) http://%1/$1 [R=301,NE,L]
Rewritecond $1 !^(index\.php|(.*)\.swf|forums|images|css|downloads|jquery|js|robots\.txt|favicon\.ico)
Rewritecond %{REQUEST_FILENAME} !-f
Rewritecond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ ./index.php?$1 [L,QSA]
# hiding the directory listing
Options -Indexes


<FilesMatch "\.(jpg|jpeg|png|gif|swf)$">
    Header set Cache-Control "max-age=604800, public"
</FilesMatch>