Matching and replacing a string in XSL - xslt

Question

I am not an XSL expert. I need to match a string and replace it with URL. String should be of a form 2 letters + 8 digits, so something like VA12345678.
Here is what I have so far (I have XSL and HTML in the same file):
<xsl:variable name="fubar" select="'testing VA12345678'" />
<xsl:variable name="fubarNew">
<xsl:call-template name="replace">
<xsl:with-param name="in" select="$fubar" />
<xsl:with-param name="old" select="'regex will go here'" />
<xsl:with-param name="new" select="'<a href='/cs/page.asp?id=VA12345678'>VA12345678</a>" />
</xsl:call-template>
</xsl:variable>
<span><xsl:value-of select="$fubarNew" /></span>
fubarNew should look like testing VA12345678 with VA12345678 linked to /cs/page.asp?id=VA12345678.
How do I add regex in here?

Answer 1

Your question is very unclear.
If - as it seems - you want to replace every occurrence of a string in the form of ########## (2 upper-case ASCII characters followed by 8 digits) with an anchor element in the form of ##########, then consider the following example:
Input
<root>
<string>Lorem ipsum dolor sit amet, consectetuer ABC123 adipiscing elit.</string>
<string>Nam interdum ante quis VA12345678 erat pellentesque elementum. Ut molestie quam sit DT87654321 amet ligula.</string>
<string>In enim. XY55551234 Duis dapibus hendrerit quam.</string>
</root>
XSLT 2.0
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
<xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:strip-space elements="*"/>
<!-- identity transform -->
<xsl:template match="#*|node()">
<xsl:copy>
<xsl:apply-templates select="#*|node()"/>
</xsl:copy>
</xsl:template>
<xsl:template match="string">
<xsl:copy>
<xsl:analyze-string select="." regex="[A-Z]{{2}}\d{{8}}" >
<xsl:matching-substring>
<a href="/cs/page.asp?id={.}">
<xsl:value-of select="." />
</a>
</xsl:matching-substring>
<xsl:non-matching-substring>
<xsl:value-of select="." />
</xsl:non-matching-substring>
</xsl:analyze-string>
</xsl:copy>
</xsl:template>
</xsl:stylesheet>
Result
<?xml version="1.0" encoding="UTF-8"?>
<root>
<string>Lorem ipsum dolor sit amet, consectetuer ABC123 adipiscing elit.</string>
<string>Nam interdum ante quis VA12345678 erat pellentesque elementum. Ut molestie quam sit DT87654321 amet ligula.</string>
<string>In enim. XY55551234 Duis dapibus hendrerit quam.</string>
</root>