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Posted to java-user@lucene.apache.org by mitu2009 <mu...@gmail.com> on 2009/10/22 03:40:35 UTC
Handling + as a special character in Lucene search
Hi,
How do i make sure lucene gives me back relevant search results when my
input string contains terms like c++? Lucene seems to ignore ++ characters.
Thanks
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Re: Handling + as a special character in Lucene search
Posted by Koji Sekiguchi <ko...@r.email.ne.jp>.
Or you can use MappingCharFilter if you are using Lucene 2.9.
You can convert "c++" into "cplusplus" prior to running Tokenizer.
Koji
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Ian Lea wrote:
> You need to make sure that these terms are getting indexed, by using
> an analyzer that won't drop them and using Luke to check. Then, if
> you are using QueryParser, you'll need to escape the special
> characters e.g. c\+\+. See
> http://lucene.apache.org/java/2_9_0/queryparsersyntax.html#Escaping%20Special%20Characters.
> And use the same analyzer at query time.
>
> Google for something like lucene special characters for more info.
>
>
> --
> Ian.
>
>
>
>
> On Thu, Oct 22, 2009 at 2:40 AM, mitu2009 <mu...@gmail.com> wrote:
>
>> Hi,
>>
>> How do i make sure lucene gives me back relevant search results when my
>> input string contains terms like c++? Lucene seems to ignore ++ characters.
>>
>> Thanks
>>
>> --
>> View this message in context: http://www.nabble.com/Handling-%2B-as-a-special-character-in-Lucene-search-tp26002815p26002815.html
>> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>>
>>
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>> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
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>>
>>
>>
>
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Re: Handling + as a special character in Lucene search
Posted by Ian Lea <ia...@gmail.com>.
You need to make sure that these terms are getting indexed, by using
an analyzer that won't drop them and using Luke to check. Then, if
you are using QueryParser, you'll need to escape the special
characters e.g. c\+\+. See
http://lucene.apache.org/java/2_9_0/queryparsersyntax.html#Escaping%20Special%20Characters.
And use the same analyzer at query time.
Google for something like lucene special characters for more info.
--
Ian.
On Thu, Oct 22, 2009 at 2:40 AM, mitu2009 <mu...@gmail.com> wrote:
>
> Hi,
>
> How do i make sure lucene gives me back relevant search results when my
> input string contains terms like c++? Lucene seems to ignore ++ characters.
>
> Thanks
>
> --
> View this message in context: http://www.nabble.com/Handling-%2B-as-a-special-character-in-Lucene-search-tp26002815p26002815.html
> Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>
>
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> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>
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Re: Handling + as a special character in Lucene search
Posted by mitu2009 <mu...@gmail.com>.
Code details: When I execute this line,I get a blank search query.
queryField =
multiFieldQueryParser.Parse(inpKeywords);keywordsQuery.Add(queryField,
BooleanClause.Occur.SHOULD);And here is my custom analyzer:
public class CustomAnalyzer : Analyzer { private static readonly
WhitespaceAnalyzer whitespaceAnalyzer = new WhitespaceAnalyzer(); public
override TokenStream TokenStream(String fieldName, System.IO.TextReader
reader) { TokenStream result =
whitespaceAnalyzer.TokenStream(fieldName, reader); result = new
StandardTokenizer(reader); result = new LowerCaseFilter(result);
result = new StopFilter(result, stop_words); return result;
}}And I'm executing search query this way:
indexSearcher.Search(searchQuery, collector);QueryParser has Escape(string
s) method but MultiFieldQueryParser does not seem to have one.Am using
Lucene.net version 2.1.0.3
Thanks for reading.
mitu2009 wrote:
>
> How do i make sure lucene gives me back relevant search results when my
> input string contains terms like c++? Lucene seems to ignore ++
> characters.
>
> Code details: When I execute this line,I get a blank search query.
>
> queryField =
> multiFieldQueryParser.Parse(inpKeywords);keywordsQuery.Add(queryField,
> BooleanClause.Occur.SHOULD);And here is my custom analyzer:
>
> public class CustomAnalyzer : Analyzer { private static readonly
> WhitespaceAnalyzer whitespaceAnalyzer = new WhitespaceAnalyzer();
> public override TokenStream TokenStream(String fieldName,
> System.IO.TextReader reader) { TokenStream result =
> whitespaceAnalyzer.TokenStream(fieldName, reader); result = new
> StandardTokenizer(reader); result = new
> LowerCaseFilter(result); result = new StopFilter(result,
> stop_words); return result; }}And I'm executing search
> query this way:
>
> indexSearcher.Search(searchQuery, collector);
>
> QueryParser has Escape(string s) method but MultiFieldQueryParser does not
> seem to have one.Am using Lucene.net version 2.1.0.3
>
>
>
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