On Jan 5, 2006, at 7:01 PM, Paul Smith wrote:
first off response to my own post, I meant PhraseQuery instead.
But, since we're only tokenizing this field ,and not storing the
entire contents of the field, I'm not sure this is ever going to
work, is it?
Sure it will :)
I notice that if I have a title "auto update", then the phrase
query trick works if it searches on
title:"0start0 auto*"
but does not find any matches for
title:"0start0 aut*"
I'm a bit stuck.
PhraseQuery does not handle wildcards. Unfortunately this is common
misunderstanding.
The MultiPhraseQuery could do this provided you expand "aut*" into
all the matching terms yourself. But here is an alternative using
the new SpanRegexQuery (in contrib/regex):
RAMDirectory directory = new RAMDirectory();
IndexWriter writer = new IndexWriter(directory, new
SimpleAnalyzer(), true);
Document doc = new Document();
doc.add(new Field("field", "auto update", Field.Store.NO,
Field.Index.TOKENIZED));
writer.addDocument(doc);
doc = new Document();
doc.add(new Field("field", "first auto update", Field.Store.NO,
Field.Index.TOKENIZED));
writer.addDocument(doc);
writer.optimize();
writer.close();
IndexSearcher searcher = new IndexSearcher(directory);
SpanRegexQuery srq = new SpanRegexQuery(new Term("field",
"aut.*"));
SpanFirstQuery sfq = new SpanFirstQuery(srq, 1);
Hits hits = searcher.search(sfq);
assertEquals(1, hits.length());
Notice that the query is "aut.*", not "aut*" such that it is a valid
regular expression for what you want. In my current project, my
custom query parser handles * and ? like WildcardQuery, but under the
covers I simply convert that into a regex by replacing ? with . and *
with .*
Erik
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