It works flawlessly!! But not with cyrillic characters, UTF-8.
Solution: you should replace following functions in *.php :
1) strrpos => JString::strrpos
2) substr => JString::substr
3) strlen => JString::strlen
4) substr_replace => JString::substr_replace
I'm new to PHP, so excuse me if I'm wrong.
But abovementioned things work for me well!
Author may find it useful, to make the extension suitable for all cyrillic developers.