Dear List,

Is it possible to use an XSL variable in a regular expression when using the "matches" function in an XSL transformation?

Say I have
<xsl:variable name="Prefix" as="xs:string" select="'PR'"/>

Then I want to use $Prefix in my regular expression like I might use XSL variables elsewhere:
matches(normalize-space(text()[1]), '^(optional beginning text)*$Prefix: [a-zA-Z ]*')

matches(normalize-space(text()[1]), concat(
'^(optional beginning text)*',
 $Prefix,
 ': [a-zA-Z ]*'))