Genshi Python expression Regex

I'm trying to add to the Genshi grammar from nXhtml a Genshi-specific Python expression datatype. I have this:

python.expression = xsd:string { pattern = "\p{Z}*$[\p{Lu}\p{Ll}\p{Lt}\d\._\p{Z}]*|$\{[p{Lu}\p{Ll}\p{Lt}\d\p{P}\p{Z}]*\}" }

But this doesn't seem to match this code fragment:

${select('*[local-name()!="title" and local-name!="meta"]')}

Please help.





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