how to use .htaccess with variables from RewriteCond and RewriteRule at the same time

Question

1. I have a htaccess code that redirects all the requests from /forum1/product to /product. The code in /forum1/product/.htaccess is as follows:

   <IfModule mod_rewrite.c>
   RewriteEngine On
   RewriteBase /
   RewriteRule ^(.*)$ /product/$1 [PT,L]
   </IfModule>
   

   This code works perfectly for "/forum1/product/", "/forum2/product/", "forum3/product/",... etc. so all my forums are using the same product code(also I have used $_SERVER['HTTP_REFERER'] in product code so that product responds distinctly for each forum).

2.

I have a new version of product which I don't want to make live yet. So am trying to set a cookie "version" and based on the version it should redirect to corresponding product_<version number> folder by referring:
How to do htaccess redirect based on cookie value

  RewriteCond %{HTTP_COOKIE} ^version=([0-9]*)$ [NC] 
  RewriteRule .* http://localhost/product_%1/ [R=301,L]
  RewriteRule .* http://local-host/product/ [R=301,L]

Both 1 and 2 works fine seperately. I want to merge these two conditions.

So if cookie "version" is set to 2 then /forum/product redirects to /product_2 but still shows the URL /forum/product but it will be using /product_2

The folder structure is as follows:

/forum1/product/.htaccess
/forum2/product/.htaccess
/forum3/product/.htaccess
/product/version.txt
/product_1/version.txt
/product_2/version.txt

I think the following code should work:

RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_COOKIE} ^version=([0-9]*)$ [NC]
RewriteRule ^(.*)$ /product_%1/$1 [PT,L]
RewriteRule ^(.*)$ /product/$1 [PT,L]

Answer 1

Got the solution:

RewriteEngine on
RewriteBase /
RewriteCond %{HTTP_COOKIE} ^version=([0-9]*)$ [NC]
RewriteRule ^(.*)$ /product_%1/$1 [PT,L]
RewriteRule ^(.*)$ /product/$1 [PT,L]

Answer 2

You can use:

RewriteEngine On

RewriteCond %{HTTP_COOKIE} version=([0-9]+) [NC] 
RewriteRule ^ /product_%1/ [L]

RewriteRule ^(.+)$ /product/$1 [L]