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Posted to java-user@lucene.apache.org by Max Lynch <ih...@gmail.com> on 2010/02/04 02:57:33 UTC

Match span of capitalized words

Hi,
I would like to do a search for "Microsoft Windows" as a span, but not match
if words before or after "Microsoft Windows" are upper cased.

For example, I want this to match: another crash for Microsoft Windows today
But not this: another crash for Microsoft Windows Server today

Is this possible?  My first attempt started with the SpanRegexQuery from the
regex contrib package, but I can't figure out how to put in a term I do want
to match but don't want to include in the final highlighting match.  Does
that make sense?

My example (using WhitespaceAnalyzer since I care about case):

 SpanRegexQuery srq1 = new SpanRegexQuery( new Term("contents", "Chase"));
 SpanRegexQuery srq2 = new SpanRegexQuery( new Term("contents",
"Bank[\\.]*"));
 SpanRegexQuery srq3 = new SpanRegexQuery( new Term("contents", "[^A-Z]*"));


Thanks,
Max

Re: Match span of capitalized words

Posted by Max Lynch <ih...@gmail.com>.
>
>
> I *think* you can get what you want using SpanNotQuery - something like the
> following, using your "Microsoft Windows" example:
>
> SpanNot:
>    include:
>        SpanNear(in-order=true, slop=0):
>            SpanTerm: "Microsoft"
>            SpanTerm: "Windows"
>    exclude:
>        SpanNear(in-order=true, slop=0):
>            SpanTerm: "Microsoft"
>            SpanTerm: "Windows"
>            SpanRegex: "^\\p{Lu}.*"
>
> Steve
>
>
>
>
This worked great, thank you guys!

-Max

RE: Match span of capitalized words

Posted by Steven A Rowe <sa...@syr.edu>.
Hi Max,

On 02/05/2010 at 10:18 AM, Grant Ingersoll wrote:
> On Feb 3, 2010, at 8:57 PM, Max Lynch wrote:
> > Hi, I would like to do a search for "Microsoft Windows" as a span, but
> > not match if words before or after "Microsoft Windows" are upper cased.
> > 
> > For example, I want this to match: another crash for Microsoft Windows
> > today But not this: another crash for Microsoft Windows Server today
> > 
> > Is this possible?  My first attempt started with the SpanRegexQuery
> > from the regex contrib package, but I can't figure out how to put in a
> > term I do want to match but don't want to include in the final
> > highlighting match. Does that make sense?
> > 
> > My example (using WhitespaceAnalyzer since I care about case):
> > 
> > SpanRegexQuery srq1 = new SpanRegexQuery(new Term("contents", "Chase"));
> > SpanRegexQuery srq2 = new SpanRegexQuery(new Term("contents", "Bank[\\.]*"));
> > SpanRegexQuery srq3 = new SpanRegexQuery(new Term("contents", "[^A-Z]*"));
> 
> I'm not sure it supports it, but I wonder if you could use a negative
> lookahead assertion?  Most regex languages support it.

I don't think this would work, since the input to a SpanRegexQuery regex is a single Term; following Terms are not included in the input.

I *think* you can get what you want using SpanNotQuery - something like the following, using your "Microsoft Windows" example:

SpanNot:
    include:
        SpanNear(in-order=true, slop=0):
            SpanTerm: "Microsoft"
            SpanTerm: "Windows"
    exclude:
        SpanNear(in-order=true, slop=0):
            SpanTerm: "Microsoft"
            SpanTerm: "Windows"
            SpanRegex: "^\\p{Lu}.*"

Steve
 


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Re: Match span of capitalized words

Posted by Grant Ingersoll <gs...@apache.org>.
On Feb 3, 2010, at 8:57 PM, Max Lynch wrote:

> Hi,
> I would like to do a search for "Microsoft Windows" as a span, but not match
> if words before or after "Microsoft Windows" are upper cased.
> 
> For example, I want this to match: another crash for Microsoft Windows today
> But not this: another crash for Microsoft Windows Server today
> 
> Is this possible?  My first attempt started with the SpanRegexQuery from the
> regex contrib package, but I can't figure out how to put in a term I do want
> to match but don't want to include in the final highlighting match.  Does
> that make sense?
> 
> My example (using WhitespaceAnalyzer since I care about case):
> 
> SpanRegexQuery srq1 = new SpanRegexQuery( new Term("contents", "Chase"));
> SpanRegexQuery srq2 = new SpanRegexQuery( new Term("contents",
> "Bank[\\.]*"));
> SpanRegexQuery srq3 = new SpanRegexQuery( new Term("contents", "[^A-Z]*"));

I'm not sure it supports it, but I wonder if you could use a negative lookahead assertion?  Most regex languages support it.

-Grant


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