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From <raghavendra.k....@barclays.com>
Subject RE: How to perform Wildcard search when using WhitespaceAnalyzer?
Date Mon, 18 Nov 2013 14:32:49 GMT
Jack,

I am using WhitespaceAnalyzer while both indexing and searching the data. To avoid the case-sensitive
dependency, I ensure that both of them are upper-cased.

I generally search against the space separated CONTENTS field for the search terms. Hence
while searching, I can imagine WhitespaceAnalyzer breaking my string based on white spaces.

For eg. there are values in index such as ANALYZER. I am trying to make searches such as ANALYZ*
and *NALYZE find these kinds of values. In other words, both leading and trailing wild card
searches.

Will provide detailed code if necessary. Please let me know what you think.

Regards,
Raghu


-----Original Message-----
From: Jack Krupansky [mailto:jack@basetechnology.com] 
Sent: Monday, November 18, 2013 12:00 AM
To: java-user@lucene.apache.org
Subject: Re: How to perform Wildcard search when using WhitespaceAnalyzer?

The presence of a wildcard character causes the query parser to completely skip analysis for
that term.

You, the writer of the query terms, need to manually simulate all the the work that the analyzer
does when a wildcard is present in a term.

What does your query actually look like, and what does the indexed data look like?

The simple answer to your question is that wildcards don't behave any differently between
the two analyzers - simply because they are not used at all for the wildcard terms.

-- Jack Krupansky

-----Original Message-----
From: raghavendra.k.rao@barclays.com
Sent: Sunday, November 17, 2013 10:14 PM
To: java-user@lucene.apache.org
Subject: How to perform Wildcard search when using WhitespaceAnalyzer?

Hi All,



Sorry to repeat this question from my previous mail chain, but I am hoping the modified subject
will catch someone's attention - in case they are familiar with this situation.



Could any one please suggest if it is possible to perform Leading and / or trailing wildcard
searches using WhitespaceAnalyzer? I was able to do such searches using StandardAnalyzer but
Lucene Search simply seems to ignore the wildcards with WhitespaceAnalyzer. The issue is also
not with the case as I have ensured that the case both in index and search terms are the same.



WhitespaceAnalyzer works well for my cause, hence I don't want to switch back to StandardAnalyzer.



////////////// Code //////////////



strBufSearchString.append("\"" + 
QueryParser.escape(strTxtSearchString.trim().toUpperCase()) + "*" + "\"");



Analyzer analyzer = new WhitespaceAnalyzer(Version.LUCENE_43);

QueryParser parser = new QueryParser(Version.LUCENE_43, "CONTENTS", 
analyzer);



query = parser.parse(strBufSearchString.toString());



//////////////////////////////////////////



Please suggest. It is real urgent.. Appreciate any possible help!



Regards,

Raghu



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_______________________________________________

This message is for information purposes only, it is not a recommendation, advice, offer or
solicitation to buy or sell a product or service nor an official confirmation of any transaction.
It is directed at persons who are professionals and is not intended for retail customer use.
Intended for recipient only. This message is subject to the terms at: www.barclays.com/emaildisclaimer.

For important disclosures, please see: www.barclays.com/salesandtradingdisclaimer regarding
market commentary from Barclays Sales and/or Trading, who are active market participants;
and in respect of Barclays Research, including disclosures relating to specific issuers, please
see http://publicresearch.barclays.com.

_______________________________________________

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