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
Jon Loken wrote:
Hi all,
First of all, well done to the implementers of Lucene. The performance
is incredible! We get search results within 20-40 ms on an index about
1.5GB.
I could not find a Lucene maillist search engine, something I am a bit
surprised about!
My question is how I can implement wild carded phrases searches like:
"boiler replac*"
This will pick up text:
"boiler replacement" and "boiler replacing"
But not:
"boiling replacement" or "boiler user replacment"
I am using the queryParser through Spring-lucene-module.
I did simply try textToSearch= "boiler replac*", but this did not work
as anticipated. Have not analyzed properly, but it seemed to interpret
this as:
boiler OR replac*
Is there a way to implements this?
Many thanks,
Jon
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