An example of a custom analyzer for RavenDB

MyLowercaseAnalyzer.cs

using System.IO;
using Lucene.Net.Analysis;

namespace MyApp.Analyzers
{
    public class MyLowercaseAnalyzer : Analyzer
    {
        public override TokenStream TokenStream(string fieldName, TextReader reader)
        {
            TokenStream t = null;
            t = new LowerCaseFilter(t);
            return t;
        }
    }
}