Apache Rewrite : not matching pattern not working - apache

Question

I want to redirect visitors to my main domain when they perform requests on my subdomain followed by a not matching URI.
For example, a visitor can access a resource at sub.domain.com/product/10 but he should be redirected to domain.com when he attempt to access other resources that not match product/:id on my subdomain like sub.domain.com/anOtherResource.
I have to do this with apache rewrite module. I found that ! operator can do the job but it's not working for me.
Here is my Rewrite configuration from .htaccess file :
RewriteCond %{HTTP_HOST} sub\.domain\.com
RewriteCond %{REQUEST_URI} !^/product/[0-9]+$
RewriteRule ^(.*)$ http://www.domain.com [L,R]
I also tested this configuration :
RewriteCond %{HTTP_HOST} sub\.domain\.com
RewriteRule !^/product/[0-9]+$ http://www.domain.com [L,R]
I don't know where is the mistake ...
[Edit]
The .htaccess file is configured for Wordpress. Here is the entire .htaccess :
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteCond %{HTTP_HOST} sub.domain.com
RewriteCond %{REQUEST_URI} !^/product/[0-9]+$
RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R]
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

Answer 1

The problem was in the Wordpress Rewrite configuration so what's happened ?
Step 1
I perform a request at sub.domain.com/product/1 so it not match these RewriteCond :
RewriteCond %{HTTP_HOST} sub.domain.com
RewriteCond %{REQUEST_URI} !^/product/[0-9]+$
Then, it not redirect to www.domain.com
Step 2
It continue the rewriting to the next Cond (Worpdress rewriting):
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
At this step, it send an Internal Redirect (not sent to the client) to sub.domain.com/index.php
Step 3
Because of the redirection, it apply again the previous RewriteCond
RewriteCond %{HTTP_HOST} sub.domain.com
RewriteCond %{REQUEST_URI} !^/product/[0-9]+$
RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R]
It match the Cond, then it redirect the client to www.domain.com while I didn't expect it.
The Solution
I fixed the problem by adding a RewriteCond on index.php as showing bellow :
RewriteCond %{HTTP_HOST} sub.domain.com
RewriteCond %{REQUEST_URI} !^/product/[0-9]+$
RewriteCond %{REQUEST_URI} !^/index.php$
RewriteRule ^(.*)$ http://www.domain.com/$1 [L,R]
Now it manage the Internal Redirection sent by the Worpress Rewriting.

Answer 2

The rewrite rules look ok, but try the following:
RewriteCond %{HTTP_HOST} ^sub[.]domain[.]com$
RewriteCond %{REQUEST_URI} !^/product/[0-9]+$
RewriteRule ^(.*)$ http://www.domain.com [L,R]
If this doesn't work, then you might need to copy and paste the entire contents of your VirtualHost configuration since it could be something else causing a problem.