Can't pass parameters to another redirect website - apache

Question

I want to redirect to another website, and pass the parameters also.
Example: I go to my website: source.example/?code=12345
Then, I want it to redirect to target.example/?code=12345.
I am currently using this for my .htaccess file, since I figured out from other posts that if I query a certain parameter, it will get passed also:
RewriteEngine On
RewriteCond %{QUERY_STRING} ^code=[NS]$
RewriteRule "www.google.com" /$1 [R=302,L]
Also, I tried many different approaches looking at these stack questions:
simple .htaccess redirect : how to redirect with parameters?
Redirect and keep the parameter in the url on .htaccess
But I can't get it running :(

Answer 1

since I figured out from other posts that if I query a certain parameter, it will get passed also
This is not true. The query string is passed through by default - there is nothing extra you need to do if you want the same query string on the target URL.
RewriteCond %{QUERY_STRING} ^code=[NS]$
RewriteRule "www.google.com" /$1 [R=302,L]
This code won't match the source URL for many reasons:
"www.google.com" - The first argument to the RewriteRule directive is a regex that matches the source URL-path (less the slash prefix). In your example the URL-path is empty.
^code=[NS]$ matches either code=N or code=S - which is not the intention from your example. (The [NS] looks like a mangled RewriteRule flag?!)
/$1 - this is the substitition string, ie. the URL you want to redirect to. (The $1 backreference is always empty, so this is meaningless.)
To redirect from source.example/?code=<number> to https://target.example/?code=<number> then try the following instead:
RewriteCond %{HTTP_HOST} ^source\.example [NC]
RewriteCond %{QUERY_STRING} ^code=\d+$
RewriteRule ^$ https://target.example/ [R=302,L]
This only matches a query string of the form code=1234. It does not match code= or code=1234&foo=bar, etc.
The query string is passed through by default.
If source.example is the only domain being hosted at the current location then you can remove the first condition that explicitly checks the requested hostname.
The order of directives in the .htaccess file is important. An external redirect like this should go near the top.