I found a problem / bug with the linkification of twitter #hashtags, that contain one or more special characters.
Example: #Utøya (Norwegian)
The solution might be changing the regex, so that it also selects a broad range of special foreign language characters.
A nice list of foreign language characters ca be found on: http://www.vistawide.com/languages/typing_foreign_language_characters.htm
Best Regards, Dick