The sequence "\t" can be used to represent a tab in an XPath regular
expression. Example:

	<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
	    <xsl:template name="main">
	        <xsl:analyze-string select="'ban&#x09;ana'" regex="\t">
	          <xsl:matching-substring><match
value="{.}"/></xsl:matching-substring>
	          <xsl:non-matching-substring><non-match
value="{.}"/></xsl:non-matching-substring>
	        </xsl:analyze-string>
	    </xsl:template>
	</xsl:stylesheet>

Output:

<?xml version="1.0" encoding="UTF-8"?>
<non-match value="ban"/><match value="&#x9;"/><non-match value="ana"/>

I don't know what you did wrong!

Michael Kay
http://www.saxonica.com/