[xsl] replacing of characters based on position

Subject: [xsl] replacing of characters based on position
From: ram <ram_kurra@xxxxxxxxxxx>
Date: Tue, 16 Nov 2010 04:14:54 +0530 (IST)
Hi,
       I have xsl variable which holds the following uuid value
(550e8400-e29b-41d4-a716-446655440000) which has '-' at 9-14-19-24 positions.
I want to go these positons 9-14-19-24 and replace the characters '-' with
zero's.
     Is there any function such as replace(position
values,character,replace character) available in xslt.

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