I have found a solution to change links in my wordpress theme, but not the links in the content. How is it possible to get the URL in the content, so I can also changed them?

Maybe someone can me help find a solution, where I can add more stores with less code. Domain example.com with an ID from an network like id=28273527.

My function looks like this:

function link_change_custom($offer_post_url){
        if (!empty($offer_post_url) && strpos($offer_post_url, 'apple.com') !== false) :
            $apple = 'https://www.network.com/promotion/click/id=1234-yxz=';           
            $offer_post_url = $apple .rawurlencode($offer_post_url); 
        endif; 
        if (!empty($offer_post_url) && strpos($offer_post_url, 'microsoft.com') !== false) :
            $microsoft= 'https://www.network./promotion/click/id=5678-yxz=';          
            $offer_post_url = $microsoft.rawurlencode($offer_post_url); 
        endif; 
        if (!empty($offer_post_url) && strpos($offer_post_url, 'dell.com') !== false) :
            $dell= 'https://www.network.com/promotion/click/id=9876-yxz=';          
            $offer_post_url = $dell.rawurlencode($offer_post_url); 
        endif; 
        return $offer_post_url; 
}