is it possible xpath expression [A-Z]?

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]+$]"/>

is it correct? second question is if it's possible doing the same thing with
literal value, as (a-z)or(A-Z)or (aA-zZ)?
but my problem is a little bit more complicated.
I must select this element with attribute:

<mets:div LABEL="Canto XL">, tha value of attribute starts with roman number I
(one)and finished with L (fifty).
what can i do to select all of these elements?

thanks to everyone who wants to help me.