regular expression on xml

Hello everyone,

      I have one question to ask and wish to get replies from you.

      In my xml application, I want to write a small parser which can  
include useful parts in an xml document but ignore the rest. The  
overhead of sax/dom parser is large. So is it reasonable to use  
regular expressions to parse xml? There are other tools like jaxb and  
jaxp. Do jaxb or jaxp fit in my application?


thank you.