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POHow to do regular expression search using lucene.Net
 

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  1. POHow to do regular expression search using lucene.Net
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    <p>I m using lucene.Net version 3.0.3. I want to do regular expression search. I tried the following code:</p> <pre><code>// code String SearchExpression = "[DM]ouglas"; const int hitsLimit = 1000000; //state the file location of the index string indexFileLocation = IndexLocation; Lucene.Net.Store.Directory dir = Lucene.Net.Store.FSDirectory.Open(indexFileLocation); //create an index searcher that will perform the search Lucene.Net.Search.IndexSearcher searcher = new Lucene.Net.Search.IndexSearcher(dir); var analyzer = new WhitespaceAnalyzer(); var parser = new MultiFieldQueryParser(Lucene.Net.Util.Version.LUCENE_30, new[] { Field_Content, }, analyzer); Term t = new Term(Field_Content, SearchExpression); RegexQuery scriptQuery = new RegexQuery(t); string s = string.Format("{0}", SearchExpression); var query = parser.Parse(s); BooleanQuery booleanQuery = new BooleanQuery(); booleanQuery.Add(query, Occur.MUST); var hits = searcher.Search(booleanQuery, null, hitsLimit, Sort.RELEVANCE).ScoreDocs; foreach (var hit in hits) { var hitDocument = searcher.Doc(hit.Doc); string contentValue = hitDocument.Get(Field_Content); } // end of code </code></pre> <p>When I try to search with patten <code>"Do*uglas"</code>, I get the results. </p> <p>But if I search with the pattern <code>"[DM]ouglas]"</code> it is giving me the following error: </p> <pre><code>"Cannot parse '[DM]ouglas': Encountered " "]" "] "" at line 1, column 3. Was expecting one of: "TO" ... &lt;RANGEIN_QUOTED&gt; ... &lt;RANGEIN_GOOP&gt; ...". </code></pre> <p>I also tried doing simple search pattern like <code>".ouglas"</code> which should give me results, as I have <code>"Douglas"</code> in my text content.</p> <p>Does anyone know how to do regular expression search using lucene.Net version 3.0.3?</p>
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