Create Custom URL structure for specific Post category

My Custom Structure is set to “/blog/%postname%/”

This works as expected, but for Posts with the Category “testimonials”, I would like to change the URL structure to be “/testimonials/%postname%/”.

I put the following code in my functions.php:

//Rewrite URLs for “testimonial” category
add_filter( ‘post_link’, ‘custom_permalink’, 10, 3 );
function custom_permalink( $permalink, $post, $leavename ) {
// Get the category for the post
$category = get_the_category($post->ID);
if ( !empty($category) && $category[0]->cat_name == “Testimonials” ) {
$cat_name = strtolower($category[0]->cat_name);
$permalink = trailingslashit( home_url(‘/’. $cat_name . ‘/’ . $post->post_name .’/’ ) );
return $permalink;
add_action(‘generate_rewrite_rules’, ‘custom_rewrite_rules’);
function custom_rewrite_rules( $wp_rewrite ) {
$regex = ‘/[sS]/’;
$new_rules = array(
trailingslashit(‘testimonials/’.$regex) => ‘/?p=’. get_page_by_path(‘$matches[1]’, OBJECT, ‘post’)->id
$wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
return $wp_rewrite;

This generates the desired URL, “” when I try to click on the desired Post, but then it returns a 404 error.

I’d like to accomplish the URL rewrite without needing to register a new Custom Post Type.

Read more here:: Create Custom URL structure for specific Post category

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