Ranjit, The problem is definitely the analyzer you are passing to QueryParser or MultiFieldQueryParser, and not the parser itself.
The following tests succeed using KeywordAnalyzer, which is a pass-through analyzer (the output is the same as the input): public void testSharpQP() throws Exception { Analyzer analyzer = new KeywordAnalyzer(); QueryParser qp = new QueryParser (Version.LUCENE_30, "default_field", analyzer); assertEquals("+c# +.net", qp.parse ("c# AND .net").toString("default_field")); } public void testSharpMFQP() throws Exception { Analyzer analyzer = new KeywordAnalyzer(); String[] fields = { "one", "two"}; MultiFieldQueryParser mfqp = new MultiFieldQueryParser (Version.LUCENE_30, fields, analyzer); assertEquals("+(one:c# two:c#) +(one:.net two:.net)", mfqp.parse("c# AND .net").toString()); } Steve > -----Original Message----- > From: Ranjit Kumar [mailto:ranjit.ku...@otssolutions.com] > Sent: Wednesday, April 27, 2011 3:24 AM > To: java-user-h...@lucene.apache.org; java-user@lucene.apache.org > Subject: Re: lucene 3.0.3 | QueryParser | MultiFieldQueryParser > > Hi, > while creating index with the help of lucene standardAnalyzer, we cannot > make difference between c, c++ and c# as lucene do not create index for > c++ and c#. To make the difference between these term I need to change > the grammar of lucene with the help of jFlex, it force me to create my > own custom analyzer. > > While I am searching for single term like c# I get correct result (also > in the case of c++) So, lucene make index for C++ and c# . Also do not > need to use any Parser. Hence, jFlex doing it work properly. > But, when I am trying to search for multiple Boolean query like c# AND > .net I need to use MultiFieldQueryParser to get correct > result(document). Then Parser stripping off # but do not dot(.) so query > became c AND .net > Also, I have made changes for c#.net, vb.net, .net all these work > properly with MultiFieldQueryParser except c# > > Thanks & Regards, > Ranjit Kumar > ========================================================================= > ========================== Private, Confidential and Privileged. This e- > mail and any files and attachments transmitted with it are confidential > and/or privileged. They are intended solely for the use of the intended > recipient. The content of this e-mail and any file or attachment > transmitted with it may have been changed or altered without the consent > of the author. If you are not the intended recipient, please note that > any review, dissemination, disclosure, alteration, printing, circulation > or Transmission of this e-mail and/or any file or attachment transmitted > with it, is prohibited and may be unlawful. If you have received this e- > mail or any file or attachment transmitted with it in error please notify > OTS Solutions at i...@otssolutions.com > ========================================================================= > ==========================