$r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
$r = common_replace_urls_callback($r, 'common_linkify');
$r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
$r = common_replace_urls_callback($r, 'common_linkify');