[xsl] Formatting a String

["CROFT, MICHAEL" <MCROFT@xxxxxxxxx>]

Is there a slick way to format a string?  For example:

Turn this:  5085551234     Into this:  (508) 555-1234

This isnt a true number, so I dont think number functions will do it.  I was
able to get this format with param's and substring functions, but its pretty
ugly.

Mike



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