[xsl] only last 14 characters

Subject: [xsl] only last 14 characters
From: henry human <henry_human@xxxxxxxx>
Date: Tue, 14 May 2013 14:16:41 +0100 (BST)
Hi
Following case:
An Existing field without certain length (could contain whitespaces). I need
ever the last 14 characters:

<data>
<invoice>
 <field >testString</field ></invoice>
</data>
???
brg
henry

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