rewriting wordpress post url " option_rewrite_rules "

I am asking about a feature in WordPress

add_filter( ‘option_rewrite_rules’, $array, $int, $int );

and how it can be used to rewrite the post URL

Here is an example that used this feature to rewrite the categories URLS to sub-domains so that the category URL became like this :

instead of :

The example :

public function change_rules_array_posts( $ruless, $post ) {
    if ( is_array( $ruless ) ) {
        echo $post->ID;         
        //replace all feed rules
        $ruless["feed/(feed|rdf|rss|rss2|atom)/?$"] = "index.php?category_name=" . $this->subdomain->slug . "&feed=$matches[1]";
        $ruless["(feed|rdf|rss|rss2|atom)/?$"]      = "index.php?category_name=" . $this->subdomain->slug . "&feed=$matches[1]";
        if ( 0 == $this->settings[ 'using_index' ] ) {
            $rules2 = array();
            $rules2["$"]                            = "index.php?category_name=" . $this->subdomain->slug . "&p=1";
            $rules2["page/?([0-9]{1,})/?$"]         = "index.php?category_name=" . $this->subdomain->slug . "&p=1&paged=$matches[1]";
            $rules = $rules2 + $rules;
    return $rules;

add_filter(‘option_rewrite_rules’, array( &$this, ‘change_rules_array’) );

The question is How can I use it for doing the same thing with posts URLS

New Updates :

i found a filter according to WordPress to change and rewrite the post URLS

but I still don’t know how to use it

This link is trying to explain how to use but I don’t know what to write inside the function :

Any idea

Read more here: rewriting wordpress post url " option_rewrite_rules "

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