The solution clicked to me as soon as I sent the email :)
The problem was that I was enclosing the search text with double quotes (for
PhraseQuery) before providing it to QueryParser and it was getting messed up as
double quotes is one of the special characters for Lucene and I guess even the
double quotes were getting escaped. Now I changed the code as follows.
Analyzer analyzer = new WhitespaceAnalyzer(Version.LUCENE_43);
QueryParser parser = new QueryParser(Version.LUCENE_43, "CONTENTS", analyzer);
query = parser.parse("\"" +
QueryParser.escape(strTxtSearchString.toUpperCase()) + "\"");
Regards,
Raghu
-----Original Message-----
From: Rao, Raghavendra: IT (NYK)
Sent: Sunday, November 17, 2013 12:36 PM
To: [email protected]
Subject: RE: WhitespaceAnalyzer vs StandardAnalyzer
Thank you very much, Eric.
WhitespaceAnalyzer is going pretty well. I am now trying to search for values
with special characters that need escaping for Lucene, but facing some issues.
I have used the QueryParser.escape() method in the past with StandardAnalyzer
and it worked fine. But now with WhitespaceAnalyzer, the final query is getting
tampered once I use the escape() method. Below is an example.
***Code***
Analyzer analyzer = new WhitespaceAnalyzer(Version.LUCENE_43);
QueryParser parser = new QueryParser(Version.LUCENE_43, "CONTENTS", analyzer);
query = parser.parse(QueryParser.escape(strTxtSearchString.toUpperCase()));
***Result***
Raw Search string passed: modern corporation It is provided to Lucene as:
"modern corporation" for PhraseQuery
Type of query: BooleanQuery
query.toString: CONTENTS:"MODERN CONTENTS:CORPORATION"
where as I am expecting:
Type of query: PhraseQuery
query.toString: CONTENTS:"MODERN CORPORATION"
Please suggest if I am doing anything wrong. As a last option, I am planning to
manually escape the special characters by preceding them with a "\".
Regards,
Raghu
-----Original Message-----
From: Erick Erickson [mailto:[email protected]]
Sent: Friday, November 15, 2013 4:45 PM
To: java-user
Subject: Re: WhitespaceAnalyzer vs StandardAnalyzer
Well, your example will work exactly as you want. And if your input is strictly
controlled, that's fine. But if you're putting in text, for instance,
punctuation will be part of the token. I.e. in the sentence just before this
one, "token" would not be found, but "token." would.
The admin/analysis page is your friend :).
You might want to consider following with a LowerCaseFilterFactory here unless
you want your searches to be case sensitive.
And do watch querying in this case. You need to escape things like the colon
and other special characters, see:
http://lucene.apache.org/core/2_9_4/queryparsersyntax.html#Escaping Special
Characters
Best,
Erick
On Fri, Nov 15, 2013 at 3:21 PM, <[email protected]> wrote:
> Hi,
>
> I implemented my Lucene solution using StandardAnalyzer for both
> indexing and searching. While testing, I noticed that special
> characters such as hyphens, forward slash etc. are omitted by this Analyzer.
>
> In plain English, the requirement is to search for individual words,
> in Lucene terms SPACE should be the only tokenizer. Also, no part of
> the text should not be modified / omitted.
>
> For eg. ModelNumber: ABC/x:123
> Here there should be only 2 tokens, "ModelNumber:" and "ABC/x:123".
>
> Based on what I read about WhitespaceAnalyzer, it sounds as though it
> can do exactly what I am looking for. Before I make this big decision,
> I also wanted to run this by you folks to check if there are any
> side-effects of switching the Analyzer - keeping in mind my requirements.
>
> Any suggestions as always would be greatly appreciated.
>
> Regards,
> Raghu
>
>
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