htaccess issue redirecting certain urls

I have a bunch of .htaccess rules that follow this format

RewriteCond %{HTTP_HOST} ^www.lazygamer\.co.za$ [NC]
RewriteRule ^(.*)$ http://www.lazygamer.net/$1 开发者_运维技巧[R=301,L]

Now I need to put in a new rule to include a category string in my URL and was given this code

RewriteRule ^/([^/]+)/$ /category/$1/ [R]

But it's not being fired for some reason, can someone please show me how to change the above string to match the rule further up.. so I check for some condition before executing the rule?

I only need this rule to fire if the url is in the format http://www.lazygamer.net/post-name/ and not when the url is in the format http://www.lazygamer.net/category/post-name/

RewriteCond %{REQUEST_URI} !^/category/.*$
RewriteRule ^([^/]+)/ /category/$1/ [R]

My htaccess file now looks like this and solves the problem

RewriteCond %{HTTP_HOST} !^images.lazygamer\.net$ [NC]
RewriteCond %{REQUEST_URI} !^/(wp-content|wp-admin|wp-includes|fixed|contact-details|advertise|about|category|submission|images|ps3|xbox-360|wii|other-news|video).*$
RewriteCond %{REQUEST_URI} !^\/$
RewriteRule ^(.*)$ http://www.lazygamer.net/fixed/$1 [R=301,L]

The second last line ignore the root folder which kept me up all night...