Tokenize a string using xslt

I have a large chunk of string in my xml and it has to be splitted and processed in my xsl.
Does any one know how to tokenize a string in xsl ?

"babukumar",
Your display name does not comply with our naming policy so I'll have to ask you to change it.
Thanks.

babukumar, we asked you to follow our naming standards a year ago and you chose to ignore us. I am closing this thread. Please change your name to something that follows our standard and then we will reopen it.