> also, since you are using 
> xsl:analyze-string, the regex is an attribute value template 
> so you can define the regexp parts separately and drop them 
> in using {}.

A word of warning here, regular expressions may perform a lot better if they
are known at stylesheet compile time. (It might be that this example works
as a constant subexpression, but one would need to check.)

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