commit and (s)

Sorry if this is obvious, but I'm having problems with a concept.  I
think commit will do what I want but I don't know how to use it in the
situation...

Situation: parsing straight, but dirty, text : email msgs :-(

(simple)text = set of paragraphs, paras = set of sentences etc.

If I have a rule (simplified for this example) like:

  para: sentence(s) EOF
  sentence: word(s) EOS(?) EOSjunk(?)

I'd like to commit once I've found each word (there's some reasoning
behind this if it's not obvious).

If I do

  para: sentence(s) EOF
  sentence: word(s) <commit> EOS(?) EOSjunk(?)

then I still get back-tracking to the first word of
the first sentence.  Same if I

  para: sentence(s) <commit> EOF
  sentence: word(s) EOS(?) EOSjunk(?)

What I'd like is to commit after each sentence (or after each
word).  How can I do this if I use the (s) format?  Is there
something silly in what I'm doing and obviously better done
another way?

Thanks for any help,
Robert McArthur
-- 
Robert McArthur		CRC for Enterprise Distributed System Technology
       			  Ph. +61 7 3365 4310        Brisbane, Australia
  			  Fax +61 7 3365 4311	
  			  [email protected]