[Pyparsing] Matching everything up to a point.

[Poromenos <por...@po...>]

Hello all,
I have spent the better part of today writing a parser to parse
natural language sentences, specifically dates. What I want to do is
something like:

Doctor's appointment on November 20

I have completed the parsing of the date part (everything from "on"
until the end), and I went on to add the term to catch everything
before the on like so:

expression = task + date

only to find to my chagrin that it cannot match. It is raising an
exception that it expects an "on" at the end of the line. Can anyone
tell me how to match everything up until a recognisable (to the
parser) date?

Thanks