WC_Query::search_post_excerpt PHP Method

    public function search_post_excerpt($where = '')
    {
        global $wp_the_query;
        // If this is not a WC Query, do not modify the query
        if (empty($wp_the_query->query_vars['wc_query']) || empty($wp_the_query->query_vars['s'])) {
            return $where;
        }
        $where = preg_replace("/post_title\\s+LIKE\\s*(\\'\\%[^\\%]+\\%\\')/", "post_title LIKE \$1) OR (post_excerpt LIKE \$1", $where);
        return $where;
    }