Reverse Tokens Template

Hi,
 
I have been trying to modify (un-sucessfully) Dimitre Novatchev's template
to reverse the order of "words" in a string (words being character
substrings seperated by a space character). Such that the string "hello
world" would become "world hello".
I was wondering if anyone would be able to offer any hints on how to
accomplish this.
 
I have tried modifying the template but as the word length is variable, (and
the words need to go back into a string, and not be output) I have been
unsuccessful in concatenating the string after removing one word at a time.
 
If this is not possible, is there a way in which I could remove one word at
a time from the end of the string?
(in a substring-before($theString, ' ') like way) Instead of the beginning?
 
I thank you for your time and for your help,
 
Regards,
 
Stephen Greene
 
National Research Council of Canada

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