remove \u2028 and \u2029 from post when updating it

I wan't to remove the invisible line and paragraph separator from the input when the user creates or edit a post. But it seems to be very inefficient. Is there other way to do this without that many DB operations?

I came with this solution adapting several examples on the internet. I added this code in functions.php:

// Add custom validation to clean the post fields.
// Originally used to remove \u2028 and \u2029 from the contents.
//----------------------------------------
function post_custom_validation ($post_id) {
    //check post 
    if ( $post_id == null || empty($_POST) )
        return;

    if ( wp_is_post_revision( $post_id ) )
        $post_id = wp_is_post_revision( $post_id );

    global $post;  
    if ( empty( $post ) )
        $post = get_post($post_id);

    global $wpdb;

    // remove \u2028 and \u2029 characters.
    // From post table
    $content = preg_replace('/[\p{Zp}\p{Zl}]+/u','',$post->post_content);
    $title   = preg_replace('/[\p{Zp}\p{Zl}]+/u','',$post->post_title);
    $excerpt = preg_replace('/[\p{Zp}\p{Zl}]+/u','',$post->post_excerpt);

    //update DB
    $where = array( 'ID' => $post_id );
    $wpdb->update( $wpdb->posts, array( 'post_content' => $content, 'post_title' => $title , 'post_excerpt' => $excerpt ), $where );

    // From postmeta table
    $lead = preg_replace('/[\p{Zp}\p{Zl}]+/u','',get_post_meta($post->ID, 'wm_lead', true));
    $subheader   = preg_replace('/[\p{Zp}\p{Zl}]+/u','',get_post_meta($post->ID, 'wm_subheader', true));
    $footer = preg_replace('/[\p{Zp}\p{Zl}]+/u','',get_post_meta($post->ID, 'wm_footer', true));

    //update DB
    $where = array( 'ID' => $post_id , 'meta_key' => 'wm_lead');
    $wpdb->update( $wpdb->wp_postmeta, array( 'meta_value' => $lead), $where );

    $where = array( 'ID' => $post_id , 'meta_key' => 'wm_subheader');
    $wpdb->update( $wpdb->wp_postmeta, array( 'meta_value' => $subheader), $where );

    $where = array( 'ID' => $post_id , 'meta_key' => 'wm_footer');
    $wpdb->update( $wpdb->wp_postmeta, array( 'meta_value' => $footer), $where );

}
add_action('save_post', 'post_custom_validation', 12 );