Splitting string into words with swedish chars

[nikkig]

I'm trying to split a string with text into words by using the php-function preg_split.\[code\]$words = preg_split('/\W/u',$text);\[/code\]It works fine except for swedish chars lite ???. Doing utf8_encode or decode doesn't help either. My guess is that preg_split only works with single byte chars and that the swedish chars are multibyte. Is there another way to do it?