Sorry.. It’s easy 🙂
remove_filter( 'sanitize_title', 'sanitize_title_with_dashes', 10, 3 );
I found part of code..
In wp-includes/post.php:
L2498: $post_name = sanitize_title($post_name);
If I deleted sanitize_title I can use capital letters in the slug.
Is it possible without modifying the post.php to filter this function?
