[Zope] Escaping parens for ZCTextIndex?

Hi List, I have a full text index, created using a custom splitter, that contains words with parens inside e.g. "3(u@c)" (n.b. it's from cuneiform tablets). Now I want to search for these words in the index but I am unable to get the parens in the query to get past the QueryParser which flags the expression as an error. Is there a way to do either escape the parens or bypass the QueryParser? Thanks Robert