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How do I get Lucene (.NET) to highlight correctly with wildcards?

开发者 https://www.devze.com 2022-12-30 22:00 出处:网络
I am using the Lucene.NET API directly in my ASP.NET/C# web application.When I search using a wildcard, like \"fuc*\", the highlighter doesn\'t highlight anything, but when I search for the whole word

I am using the Lucene.NET API directly in my ASP.NET/C# web application. When I search using a wildcard, like "fuc*", the highlighter doesn't highlight anything, but when I search for the whole word, like "fuchsia", it highlights fine. Does Lucene have the ability to highlight using the same logic it used to match with?

Various maybe-relevant code开发者_高级运维-snippets below:

var formatter = new Lucene.Net.Highlight.SimpleHTMLFormatter(
    "<span class='srhilite'>",
    "</span>");

var fragmenter = new Lucene.Net.Highlight.SimpleFragmenter(100);
var scorer = new Lucene.Net.Highlight.QueryScorer(query);
var highlighter = new Lucene.Net.Highlight.Highlighter(formatter, scorer);
highlighter.SetTextFragmenter(fragmenter);

and then on each hit...

string description = Server.HtmlEncode(doc.Get("Description"));
var stream = analyzer.TokenStream("Description", 
    new System.IO.StringReader(description));
string highlighted_text = highlighter.GetBestFragments(
    stream, description, 1, "...");

And I'm using the QueryParser and the StandardAnalyzer.


you'll need to ensure you set the parser rewrite method to SCORING_BOOLEAN_QUERY_REWRITE.

This change seems to have become necessary since Lucene v2.9 came along.

Hope this helps,

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