Cheers, Out of interest, how did you go about it in the end?
jloken wrote: > > Hi, > > I posed a similar question on 09 May 08. > > The response was as below. I did not go down this route however, as a > wild carded 'exact' phrase is in a way contradictory. > Regards > Jon > > > > Hi, > > Here's a searchable mailing list archive: > http://www.gossamer-threads.com/lists/lucene/java-user/ > > As regards the wildcard phrase queries, here's one way I think you could > do it, but it's a bit of extra work. If you're using QueryParser, you'd > have to override the "getFieldQuery" method to use span queries instead > of phrase queries. > > A phrase query can be implemented as a span query with a span or "slop" > > factor of 1. So, once you have the PhraseQuery object, you would: > > 1. Extract the terms > 2. For each one, check if it contains a "*" or a "?" > 3. If it does, create a WildcardQuery using that term, and re-write it > using IndexReader.rewrite method. This expands the wildcard query into > all it's matches. > 4. Create an array of SpanTermQuery objects, (one SpanTermQuery for each > term that matched you wildcard); then add that array to a SpanOrQuery. > 5. Repeat 2 to 4 for each wildcard term in the phrase. > 6. Finally (!), create a SpanNearQuery, adding all the original terms in > order, but substituting your SpanOrQuerys for the wildcard terms. Use a > slop of 1, and set the inOrder flag to true. > > So, essentially, you'd end up with: (you'll have to excuse me if I > haven't rendered the span queries correctly as strings here - but this > should give the general idea...) > > spanNear[boiler (spanOr[replacement replacing])] > > So it will accept *either* "replacement" or "replacing" adjacent to > "boiler", which is what you want. > > As you can see, it's a bit of work - but if you add this functionality > to the QueryParser, you'll can re-use it a lot! > > Hope that helps! > > -JB > > > > > > > -----Original Message----- > From: mick l [mailto:[EMAIL PROTECTED] > Sent: 24 June 2008 13:29 > To: java-user@lucene.apache.org > Subject: Wildcard and Literal Searches combined > > > Folks, > My users require wildcard searches. Sometimes their search phrases > contain spaces. I am having trouble trying to implement a wildcard > search on strings containing spaces, so if the term includes spaces I > force a literal search by adding double quotes to the search term. > So the search string for 'Dublin' becomes search term (Dublin*) whereas > search string 'Dublin City' becomes ("Dublin City") > > > If I use (Dublin City*) I get all instances of Dublin OR City in the > results which is not what I am looking for. > > Is there any way I can combine the wildcard search and the literal? > > Heres my existing code. Its in c# with Lucene.Net > > //if input has spaces we do a literal search if (sSearchQuery.IndexOf(" > ") < 0) { sSearchQuery = "(" + sSearchQuery + "*)"; } else { > sSearchQuery = "(\"" + sSearchQuery + "\")"; } IndexSearcher searcher = > new IndexSearcher(sIndexLocation); Hits oHitColl = > searcher.Search(oParser.Parse(sSearchQuery)); > > Thanks folks > -- > View this message in context: > http://www.nabble.com/Wildcard-and-Literal-Searches-combined-tp18089950p > 18089950.html > Sent from the Lucene - Java Users mailing list archive at Nabble.com. > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > ______________________________________________ > This email has been scanned by Netintelligence > http://www.netintelligence.com/email > > > > BiP Solutions Limited is a company registered in Scotland with Company > Number SC086146 and VAT number 383030966 and having its registered office > at Park House, 300 Glasgow Road, Shawfield, Glasgow, G73 1SQ > **************************************************************************** > This e-mail (and any attachment) is intended only for the attention of the > addressee(s). 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