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From "Matthew B. Merrill" <...@nmi.net>
Subject Re: Escape woes
Date Wed, 17 Jul 2002 11:54:27 GMT

I'll bet it has something to do with numbers vs letters around the
hyphen.  The example I had that worked with a single hyphen was "#-#",
like "1-1" or "4-13".

Your example is also number-based (YYYY-MM-DD).

Anyone care to weigh in with a detailed treatise on what's happening and
why?

--- Matt

"Matthew B. Merrill" wrote:
> 
> I tried double quotes when using StandardAnalyzer; things got *really*
> strange then.  If I was searching for a string that contained just one
> hyphen, I got what I expected.  If the string contained *two* hyphens,
> then I got things like:
> 
> search string I construct: (host:"ny-dns-2")
> query as reported by toString(): +host:"ny dns-2"
> 
> Note the missing first hyphen.
> 
> I don't understand why this seems to work for you but not for me; you're
> using v1.2rc5?  That is the latest release version, correct?
> 
> --- Matt
> 
> Keith Gunn wrote:
> >
> > I had the same problem when indexing date fields i.e. YYYY-MM-DD
> > I use the standard analyzer and i use double quotes and it works fine.
> >
> > On Tue, 16 Jul 2002, Matthew B. Merrill wrote:
> >
> > >
> > > I think I have a workaround, but I'm not sure why it works (since it
> > > doesn't mesh with the docs about escaping special chars).
> > >
> > > In the examples below, I was using StandardAnalyzer.  If I switch to
> > > using WhitespaceAnalyzer, then one of the examples that fails (in the
> > > note below) becomes:
> > >
> > > search string I construct: (host:"ny-dns-2")
> > > query as reported by toString(): +host:ny-dns-2
> > >
> > > returns the results I expect.
> > >
> > > I just don't understand why.
> > >
> > > I didn't have to escape the hyphen.  In fact, if I do escape them, I'm
> > > back to no results.  I did have to quote the string I wanted to find.
> > >
> > > Does anyone have an explanation they would care to share?
> > >
> > > Thanks.
> > >
> > > --- Matt
> > >
> > > "Matthew B. Merrill" wrote:
> > > >
> > > > Hello all.  I'm having a problem with escaping Lucene characters, and
I
> > > > was wondering if anyone here could help.
> > > >
> > > > I've set up a Keyword field for my documents named "host".  "host" can
> > > > contain names like "ocrlprod" or "ny-dns-2".  I'm pretty sure that I
> > > > want it to be a Keyword (rather than Text), so that it isn't tokenized.
> > > >
> > > > The problem is when I need to search against that field.  For example:
> > > >
> > > > search string I construct: (host:orclprod)
> > > > query as reported by toString(): +host:orclprod
> > > >
> > > > returns the results I expect.  Great so far.
> > > >
> > > > search string I construct: (host:ny-dns-2)
> > > > query as reported by toString(): +(host:ny -dns -2)
> > > >
> > > > does not return any results.  After reading about needing to escape
> > > > special characters, I'm not surprised, and move on to...
> > > >
> > > > search string I construct: (host:ny\-dns\-2)
> > > > query as reported by toString():  +host:"ny dns 2"
> > > >
> > > > does not return any results.  What happened to my hyphens?!?!  Is there
> > > > any way to get them to show up, as I expect I need them to?
> > > >
> > > > Thanks for any help.
> > > >
> > > > --- Matt
> > > >
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