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how to assign part of an attributes value to another

Subject: how to assign part of an attributes value to another attribute within the same element?
From: "Tony Zanella" <tony.zanella@xxxxxxxxx>
Date: Thu, 29 May 2008 19:51:32 -0400
 how to assign part of an attributes value to another
With XSL Processor: Saxon 8B and XSL v. 2.0, here is my test case:

<?xml version="1.0" encoding="UTF-8"?>
    <ptr target="abc.07.7.1fm" n=""/>
    <ptr target="abc.07.7.6tm" n=""/>

Here is my stylesheet:

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="2.0">

    <xsl:template match="@*|node()">
            <xsl:apply-templates select="@*|node()"/>

    <xsl:template match="ptr[@target|@n]">
        <xsl:element name="ptr">
            <xsl:attribute name="target" select="@target"/>
            <xsl:attribute name="n" select="@target"/>


The output I get is:

<?xml version="1.0" encoding="UTF-8"?><root>
    <ptr target="abc.07.7.1fm" n="abc.07.7.1fm"/>
    <ptr target="abc.07.7.6tm" n="abc.07.7.6tm"/>

This is not quite what I want, which is:

<?xml version="1.0" encoding="UTF-8"?><root>
    <ptr target="abc.07.7.1fm" n="1"/>
    <ptr target="abc.07.7.6tm" n="6"/>

My thought is: if I could reach into the @target attribute value, and
grab whatever numeral appears between the last period and tm or fm,
assign it as the same ptr elements @n attribute value, that would be
Theoretically, I can get the number I want by matching with the regex:
and replacing with $1 (in Perl syntax, which my editor supports), and
I have what I want to assign as the value of the @n attribute.
I don't know if or how XSLT can help. If you know, I thank you in
advance for sharing!

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