oh come on... dollar sign... section sign... on the first look they look the same. Sorry for that.
But it does not change anything from my first sentence. You check if there is any section sign or any other char and that multiple times. You can also check if the word contains a section sign or not. The regex itself does not replace anything btw...
If your like to replace the § sign then do it via the string replace function
http://msdn.microsoft.com/en-us/library/vstudio/czx8s9ts%28v=vs.100%29.aspx