> Hi all, i've a problem and a question for you. I know that is 
> possible to build xpath expression like this:
> 
> <xsl:template match="mets:div[@LABEL[^Pagina [0-9]+$]"/>

No, this isn't a valid XPath expression. You're mixing XPath syntax with
regular expression syntax. You need

<xsl:template match="mets:div[matches(@LABEL, '^Pagina [0-9]+$')]"/>

The second argument to matches can be any regular expression (conforming to
the rules for regular expressions defined in the XPath specification),
including of course regular expressions like '[A-Z]*'.

Regards,

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