[Pyparsing] negative lookahead problem

[Ken K. <ksk...@gm...>]

In the example at http://pastebin.com/m8248134, I've taken the
streetAddressParser.py example and added a failing test to show that
the street name grammar is too naive.

I've been trying to fix it using negative lookahead.. is this the
right general approach?  My attempt causes pyparsing to loop endlessly
-- any hints?

I'm using version 1.5.0.

thanks!
-Ken