[Pyparsing] How do you look ahead to the next character?

[Kenneth L. <ke...@lo...>]

HI,

I've got a grammar which checks a search query to see if it is valid.  The
problem is that the grammar is allowing through items like 'foo:bar' as
'foo AND bar' (implicit AND).  Is there a way to check that a Regex has
parsed the entire term, i.e. that the next char is a space or EOL, and fail
if not?

I've tried '(?=$|\s)' as a positive lookahead, but that always matches.

...Ken