Named parameter support breaks with postgres casting syntax

Postgres supports a casting syntax like "SELECT '2011-01-01'::date". I recently wrote a query like: "SELECT * FROM table WHERE my_date BETWEEN ?-'1 week'::interval AND ?" and was surprised to receive strange errors about java.sql.Date not supporting the "interval" property. It would appear that the regex parsing that identifies named parameters is a bit broken in this instance.