I have no clue, but that would really surprise me. Did you import org.apache.lucene.search.regex.RegexQuery
?? Have fun Erick On Mon, May 4, 2009 at 1:19 PM, Huntsman84 <tpgarci...@gmail.com> wrote: > > Ok, I will try that, just one more question. > > Do you know why there is a class called "RegexQuery" that appears in the > API > documentation but doesn't exist in the lucene-core-2.4.1.jar? I think that > class would be very useful for my problem... > > Thank you so much!! > > > Erick Erickson wrote: > > > > "the guys" really helped me understand the issues with wildcards, > > it's harder than you think <G>. Try looking over the searchable > > archive for a thread titled "I just don't get wildcards at all" from a > > couple of hears ago. Note: Lucene has advanced significantly > > since then, but the underlying combinatorial complexity of > > wildcards is still there. > > > > Some people have found joy with n-gram representations for > > this kind of problem, a lot depends upon how big your corpus is > > and what exactly your requirements are. Search the archive for > > ngram (or n-gram) for lots of discussion on that topic. > > > > Anyway, something to think about. > > > > Best > > Erick > > > > On Mon, May 4, 2009 at 12:48 PM, Huntsman84 <tpgarci...@gmail.com> > wrote: > > > >> > >> My aim is to handle * phrases *, as you say, but I don't know how to > >> build > >> a > >> WildCardQuery for that purpose... I read in the documentation that those > >> kind of queries can't start with '*' (e.g. * phrase *), so I tryed > >> MultiPhraseQuery instead. > >> > >> Forgive me if I am too newbie, 10 days ago I didn't know this tool > >> existed... > >> > >> > >> Erick Erickson wrote: > >> > > >> > Why are you using MultiPhraseQuery? It appears (warning, > >> > I haven't really used it) to be designed to handle *phrases*. > >> > You're problem statement isn't looking at phrases at all, > >> > just a wildcard single terms. And you're supposed to > >> > call the first MPQ.add with, say, the first word of the > >> > *phrase*, not a term vector. So what happens when your > >> > first add is an array of Terms I have no clue...... > >> > > >> > So I'd instead use RegexTermEnum (or possibly > >> > WildcardTermEnum, don't know how this latter > >> > works with leading wildcards, you'll have to check) > >> > to enumerate the first 200 matching terms, and > >> > add them clause by clause to a BooleanQuery, > >> > and then use the BooleanQuery to search...... > >> > > >> > But I'd also have to ask how users will feel about > >> > getting some small partial match of the "real" data > >> > set. By taking the first 200 Terms you find, it looks > >> > to the user either arbitrary on incomplete. Think about > >> > using, say, WildcardTermEnum to construct a Filter > >> > that you then pass to your search. Constructing > >> > Filters is quite fast, although you lose the wildcarded > >> > terms' contributions to the score (don't worry about this > >> > last IMO). > >> > > >> > > >> > Best > >> > Erick > >> > > >> > On Mon, May 4, 2009 at 11:21 AM, Huntsman84 <tpgarci...@gmail.com> > >> wrote: > >> > > >> >> > >> >> Hi > >> >> > >> >> I've tryed this with MultiPhraseQuery, but it always returns me all > >> >> documents of the index, no matter what expression I use. > >> >> > >> >> I've read that adding a set of terms wich their values are all the > >> >> entered > >> >> query (e.g. "str"), the search works as the symbol "*" (e.g. "str*"), > >> so > >> >> I > >> >> tryed that. > >> >> > >> >> My code is like this: > >> >> > >> >> // prompt the user > >> >> System.out.println("Enter query: "); > >> >> > >> >> String line = in.readLine(); //if I put "str", I want all matches > like > >> >> "string", "strong", "astray".... > >> >> > >> >> line = line.trim(); > >> >> > >> >> //I thought this would be ok... > >> >> MultiPhraseQuery mpquery = new MultiPhraseQuery(); > >> >> TermEnum te = reader.terms(new Term("contents",line)); > >> >> > >> >> /*Home-made conversion from TermEnum to Term[]... I get just 200 > >> matches, > >> >> I > >> >> don't want my > >> >> machine busy...*/ > >> >> Term[] terms = new Term[200]; > >> >> int j=0; > >> >> > >> >> while(te.next() && j<200){ > >> >> terms[j] = te.term(); > >> >> j++; > >> >> } > >> >> > >> >> mpquery.add(terms); > >> >> > >> >> Query query = parser.parse(line); > >> >> System.out.println("Searching for: " + query.toString(field)); > >> >> > >> >> Date start = new Date(); > >> >> > >> >> Hits hits = searcher.search(mpquery); > >> >> for(int k = 0; k<100; k++){ > >> >> //when I print the results of the search, none of the values match > >> >> with > >> >> the query... > >> >> > System.out.println(hits.doc(k).getField("contents").stringValue()); > >> >> } > >> >> > >> >> > >> >> > >> >> Ian Lea wrote: > >> >> > > >> >> > Hi > >> >> > > >> >> > > >> >> > This is possible. There is an entry on wildcards in the FAQ. See > >> >> > also RegexQuery and search the mailing lists for ngrams. > >> >> > > >> >> > Depending on your setup and requirements you may need to be aware > of > >> >> > the performance implications of wild card searching, particularly > >> >> > leading wildcards as will be required for the example you give. > See > >> >> > the FAQ and javadocs for WildcardQuery. > >> >> > > >> >> > > >> >> > -- > >> >> > Ian. > >> >> > > >> >> > On Thu, Apr 30, 2009 at 11:46 AM, Huntsman84 <tpgarci...@gmail.com > > > >> >> wrote: > >> >> >> > >> >> >> Hello, > >> >> >> > >> >> >> > >> >> >> > >> >> >> I am new to Lucene, and I don't know if it is possible to obtain > >> >> results > >> >> >> providing part of the keyword. > >> >> >> > >> >> >> > >> >> >> > >> >> >> For example, if I try to search "in", it should return all matches > >> >> with > >> >> >> "string", "meaning", "trinity"... > >> >> >> > >> >> >> > >> >> >> > >> >> >> Am I expecting too much? > >> >> >> > >> >> >> > >> >> >> > >> >> >> Thank you so much! > >> >> > > >> >> > > >> --------------------------------------------------------------------- > >> >> > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > >> >> > For additional commands, e-mail: java-user-h...@lucene.apache.org > >> >> > > >> >> > > >> >> > > >> >> > >> >> -- > >> >> View this message in context: > >> >> > >> > http://www.nabble.com/Searching-for-partial-matches-tp23313810p23370618.html > >> >> Sent from the Lucene - Java Users mailing list archive at Nabble.com. > >> >> > >> >> > >> >> --------------------------------------------------------------------- > >> >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > >> >> For additional commands, e-mail: java-user-h...@lucene.apache.org > >> >> > >> >> > >> > > >> > > >> > >> -- > >> View this message in context: > >> > http://www.nabble.com/Searching-for-partial-matches-tp23313810p23372180.html > >> Sent from the Lucene - Java Users mailing list archive at Nabble.com. > >> > >> > >> --------------------------------------------------------------------- > >> To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > >> For additional commands, e-mail: java-user-h...@lucene.apache.org > >> > >> > > > > > > -- > View this message in context: > http://www.nabble.com/Searching-for-partial-matches-tp23313810p23372686.html > Sent from the Lucene - Java Users mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > For additional commands, e-mail: java-user-h...@lucene.apache.org > >