> what Lucene is good and supposed to be used and for what it is not good and not supposed to be used?
I guess it is a too broad question to answer. If you need comprehensive information, see the official site and documentation: http://lucene.apache.org/core/ http://lucene.apache.org/core/7_4_0/index.html As far as questions in your previous posts, Lucene is (originally) a full-text search engine, not a regex engine. If you need regex engine, you should seek right tools for the task. Regards, Tomoko 2018年8月2日(木) 15:52 Gordin, Ira <ira.gor...@sap.com>: > Hi all, > > Would you mind to explain me or/and send some links on explanations for > what Lucene is good and supposed to be used and for what it is not good and > not supposed to be used? > > Thanks a lot in advance, > Ira > > -----Original Message----- > From: Tomoko Uchida <tomoko.uchida.1...@gmail.com> > Sent: Wednesday, August 1, 2018 2:35 PM > To: java-user@lucene.apache.org > Subject: Re: Search in lines, so need to index lines? > > Ira, > > I do not understand your requirements, but essentially lucene is not for > regex searching. > There are tools for fast regular expression search, if you do not satisfy > with java standard library, for example: > https://github.com/google/re2j > > And yes, grep command would be the best tool for you. > > Tomoko > > 2018年8月1日(水) 20:01 Gordin, Ira <ira.gor...@sap.com>: > > > Hi Tomoko, > > > > I need to search in many files and we use Lucene for this purpose. > > > > Thanks, > > Ira > > > > -----Original Message----- > > From: Tomoko Uchida <tomoko.uchida.1...@gmail.com> > > Sent: Wednesday, August 1, 2018 1:49 PM > > To: java-user@lucene.apache.org > > Subject: Re: Search in lines, so need to index lines? > > > > Hi Ira, > > > > > I am trying to implement regex search in file > > > > Why are you using Lucene for regular expression search? > > You can implement this by simply using java.util.regex package? > > > > Regards, > > Tomoko > > > > 2018年8月1日(水) 0:18 Gordin, Ira <ira.gor...@sap.com>: > > > > > Hi Uwe, > > > > > > I am trying to implement regex search in file the same as in editors, > in > > > Notepad++ for example. > > > > > > Thanks, > > > Ira > > > > > > -----Original Message----- > > > From: Uwe Schindler <u...@thetaphi.de> > > > Sent: Tuesday, July 31, 2018 6:12 PM > > > To: java-user@lucene.apache.org > > > Subject: RE: Search in lines, so need to index lines? > > > > > > Hi, > > > > > > you need to create your own tokenizer that splits tokens on \n or \r. > > > Instead of using WhitespaceTokenizer, you can use: > > > > > > Tokenizer tok = CharTokenizer. fromSeparatorCharPredicate(ch -> > ch=='\r' > > > || ch=='\n'); > > > > > > But I would first think of how to implement the whole thing correctly. > > > Using a regular expression as "default" query is slow and does not look > > > correct. What are you trying to do? > > > > > > Uwe > > > > > > ----- > > > Uwe Schindler > > > Achterdiek 19, D-28357 Bremen > > > http://www.thetaphi.de > > > eMail: u...@thetaphi.de > > > > > > > -----Original Message----- > > > > From: Gordin, Ira <ira.gor...@sap.com> > > > > Sent: Tuesday, July 31, 2018 4:08 PM > > > > To: java-user@lucene.apache.org > > > > Subject: Search in lines, so need to index lines? > > > > > > > > Hi all, > > > > > > > > I understand Lucene knows to find query matches in tokens. For > example > > > if I > > > > use WhiteSpaceTokenizer and I am searching with /.*nice day.*/ > regular > > > > expression, I'll always find nothing. Am I correct? > > > > In my project I need to find matches inside lines and not inside > words, > > > so I > > > > am considering to tokenize lines. How I should to implement this > idea? > > > > I'll really appriciate you have more ideas/implementations. > > > > > > > > Thanks in advance, > > > > Ira > > > > > > > > > > > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > > > > > > > -- > > Tomoko Uchida > > > > > -- > Tomoko Uchida > -- Tomoko Uchida
