Overriding Sitefinity's Lucene Search Service

CustomLuceneSearchService.cs

// Example of custom Search Service that can add boosting
public class DaytonLuceneSearchService : LuceneSearchService
{
    private static readonly Regex LuceneEscape = new Regex(@"(\+|-|&&|\|\||!|\(|\)|\{|\}|\[|\]|\^|""|~|\*|\?|:|\\)", RegexOptions.Compiled);

    protected override string BuildQuery(ISearchQuery input)
    {
        input.Text = LuceneEscape.Replace(input.Text, match => @"\\" + match.Captures[0].Value);
        
        string baseQuery = base.BuildQuery(input);

        if (input is CustomSearchQuery)
        {
            var boostedQuery = input as CustomSearchQuery;
            if (boostedQuery.BoostedField != null)
            {
                var kvp = boostedQuery.BoostedField.Value;
                baseQuery += " AND (" + kvp.Key + ":\"" + kvp.Value + "\"^100 OR *:*)";
            }
        }

        return baseQuery;
    }
}