Ignore special characters in Examine

问题:

In Umbraco, I use Examine to search in the website but the content is in french. Everything works fine except when I search for "Français" it's not the same result as "Francais". Is there a way to ignore those french characters? I try to find a FrenchAnalyser for Leucene/Examine but did not found anything. I use Fuzzy so it return results even if the words is not the same.

Here's the code of my search :

public static ISearchResults Search(string searchTerm)
        {
            var provider = ExamineManager.Instance.SearchProviderCollection["ExternalSearcher"];
            var criteria = provider.CreateSearchCriteria(BooleanOperation.Or);

            var crawl = criteria.GroupedOr(BoostedSearchableFields, searchTerm.Boost(15))
            .Or().GroupedOr(BoostedSearchableFields, searchTerm.Fuzzy(Fuzziness))
            .Or().GroupedOr(SearchableFields, searchTerm.Fuzzy(Fuzziness))
            .Not().Field("umbracoNavHide", "1");

            return provider.Search(crawl.Compile());
        }

回答1:

We ended up using a custom analyer based on the SnowballAnalyzer

public class CustomAnalyzer : SnowballAnalyzer
{
    public CustomAnalyzer() : base("French") { }

    public override TokenStream TokenStream(string fieldName, TextReader reader)
    {
        TokenStream result = base.TokenStream(fieldName, reader);

        result = new ISOLatin1AccentFilter(result);

        return result;
    }
}

回答2:

Try using Regex like this below:

var strInput ="Français";
var strToReplace = string.Empty;
var sNewString = Regex.Replace(strInput, "[^A-Za-z0-9]", strToReplace);

I've used this pattern "[^A-Za-z0-9]" to replace all non-alphanumeric string with a blank.

Hope it helps.