WordPress - Rewrite Root Rules

WordPress - Rewrite Root Rules.php

/**
 **================================================================================================================**
 *   Rewrite Root Rules
 **================================================================================================================**
 **================================================================================================================**
 **/
add_action('generate_rewrite_rules', 'roots_add_rewrites');
function roots_add_rewrites($content) {
    $theme_name = next(explode('/themes/', get_stylesheet_directory()));
    global $wp_rewrite;
    $roots_new_non_wp_rules = array(
//        '(img|js|css|fonts)/(.*)'      => 'wp-content/themes/'. $theme_name . '/$1/$2',
        '(?:\/)?[a-zA-Z\d\/]*?\/?(img|js|css|fonts)\/(.*)'      => 'wp-content/themes/'. $theme_name . '/$1/$2'
    );
    $wp_rewrite->non_wp_rules += $roots_new_non_wp_rules;
}