.htaccess - Rewrite individual URLs to one URL with GET parameter

I have a list of domains that are specific to individual products, such as

GreatProduct.com

SomeOtherProduct.com

SomeCustomProduct.com

etc.

I want to now redirect these so that they will point to

mydomain.com/products/allproducts.php?prod=ABCD?type=STAND

mydomain.com/products/allproducts.php?prod=ABGH?type=STAND

mydomain.com/products/allproducts.php?prod=ABGH?type=CUSTOM

etc.

(I know there should be "http://www. in front of these, but I'm restricted from posting more than two links)

I am now pointing each domain to a separate root directory, so I intend to place a different .htaccess into each domain's root.

So far, I'm able to use .htaccess to send eac开发者_JAVA百科h domain to mydomain.com/products/allproducts.php, but the parameters are not working properly.

This .htaccess,

redirectMatch 301 ^(.*)$ http://www.mydomain.com/products/allproducts.php%3fprod=ABCD%26type=SAME  
redirectMatch permanent ^(.*)$ http://www.mydomain.com/products/allproducts.php%3ftwn=ABCD%26type=SAME  

results in

mydomain.com/products/allproducts.php%253prod=ABCD%2526type=SAME

I've found lots of examples of turning a paramter-based URL into one without, but nothing like this!

Thanks!

@user643373

Does this have to be in an .htaccess file?

mod_rewrite might provide a solution for this:

RewriteEngine On
RewriteCond "%{HTTP_HOST}" "!allproducts"
RewriteCond "%{HTTP_HOST}" "^(?:www\.)?([^.]+)\.com" [NC]
RewriteRule "(.*)"         "http://mydomain.com/products/allproducts.php?prod=%1&type=SAME" [QSA,R=301,L]

I don't know what you want to do with the STAND, SAME, and CUSTOM bits..