I am looking for a code that can change the permalink of all my post who have a certain Tag.

Regular permalink structure:


The permalink structure I want for the specific category:


The following code I tried :

add_filter( 'post_link', 'custom_permalink', 10, 3 );
function custom_permalink( $permalink, $post, $leavename ) {
    $tags = get_the_tags($post->ID); 
    if (  !empty($tags) && $tags[0]->name == "MYTAG" ) {
        $permalink = trailingslashit( home_url('/'. $post->post_name .'/' ) );
    return $permalink;
add_action('generate_rewrite_rules', 'custom_rewrite_rules');
function custom_rewrite_rules( $wp_rewrite ) {
    $new_rules['^([^/]+)/?$'] = 'index.php?name=$matches[1]';
    $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
    return $wp_rewrite;

The code is working BUT now all my pages (except the home) are showing an error 404. I guess that my rules in "$new_rules" are not perfect.

Does someone has any clue ?

Best regards, Jonathan A.

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