content query web part xsl regex

I'm trying to transform an incoming text property in my XSL using a regular expression, something similar to:

<xsl:value-of select="replace(@Telephone, '^*.{}')" />

but this does not seem to work. I've read blogs where they delve into analyze-string things and such which I don't understand.

Am I doing something wrong?

Thanks, Eric

The replace() function is only available in XPath 2.0 (XSLT 2.0).

AFAIK SharePoint doesn't use XSLT 2.0.

Waldek Mastykarz has written on the way you can extend CQWP with custom functions. See Extending Content Query Web Part XSLT with custom functions