Fillip H.
With pleasure...
We Changed this:
if (preg_match('/[^\w-]/i', $letter) OR in_array($letter, array(';', '', ' ', "\r", "\n", "\t", "\s", ".", ","))) // in_array($letter, array(';', '', ' ', "\r", "\n", "\t", "\s", ".", ","))
into this:
if (...