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From "Rakesh Ayilliath" <ayilli...@hotmail.com>
Subject Re: Locating term in search results question
Date Fri, 19 Jul 2002 14:12:41 GMT
Check
http://www.iq-computing.de/lucene/highlight.htm

-Rakesh.


----- Original Message -----
From: "Ned Regina" <nrlist@ergito.com>
To: <lucene-user@jakarta.apache.org>
Sent: Friday, July 19, 2002 7:24 PM
Subject: Locating term in search results question


> I need to locate a term in the text field of a document returned in a
> search result.  I'm using regular expressions, but they're not always
> accurate, and Lucene doesn't seem to index positional information.
> Optimally, I could use the same algorithm that matches documents in an
> index, but I don't know how to go about doing that.  Also, I'm
> concerned that searching the search results could get horribly
> processor-intensive.
>
> For Example:
>
> I've got a document with a field containing the following text:
>
> "A chicken makes a lousy house pet."
>
> When a user runs a search for "chicken", I'd like to be able to
> accurately locate it within the results in order to highlight it.
> This is a simple example that could easily be handled by a regular
> expression.
>
> However, if I've got the following text:
>
> "Cytotoxic T cells (also known as killer T cells) possess the capacity
> to lyse an infected target cell."
>
> It becomes more difficult to accurately locate the term which caused
> the match if the search text was "T cell".  The regular expressions
> begin to get more and more complicated with a higher probability of
> inaccuracy.  In this case, you would have to be sure not to match "t
> cell" in "target cell".
>
> If Lucene had a facility to determine the position of a term in the
> text, it would be much easier to highlight.  Any suggestions would be
> great.  Thanks.
>
>
> Ned Regina
> www.ergito.com
>
>
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