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

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

On Mon, Aug 13, 2012 at 10:15 AM, Kenneth Loafman <ke...@lo...>wrote:

> 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.
>

Never mind.  I needed what amounts to a negative lookahead assertion in the
grammar.  I was thinking one level too low.  So, the new term grammar would
just be  'grammar + ~other_stuff'.

...Ken