c# - 如何在 Azure 搜索中允许自定义分析器使用通配符

Question

感谢您提前提供的帮助。

我正在使用 Azure 搜索 .Net SDK 构建索引器。我目前也在使用自定义分析器

在使用自定义分析器之前，我使用的是EnLucene分析器，它允许我使用通配符搜索*。比如我是用让用户搜索后缀搜索的。如果用户搜索“app”，则会返回“apple、application、approach”等结果。请不要建议自动完成或建议，因为建议器不能与自定义分析器一起使用。我不想创建仅仅因为建议者就增加了 20 个搜索字段。 (一项用于建议，一项用于搜索)。

下面是我的自定义分析器示例。它不允许我使用 * 进行部分匹配。我不是在寻找任何前缀或后缀部分匹配的 NGram 解决方案。我实际上想使用通配符 *。我该怎么做才能允许通配符搜索？

var definition = new Index()
{
    Name = indexName,
    Fields = mapFields,
    Analyzers = new[]
    {
        new CustomAnalyzer
        {
            Name = "custom_analyzer",
            Tokenizer = TokenizerName.Whitespace,
            TokenFilters = new[]
            {
                TokenFilterName.AsciiFolding,
                TokenFilterName.Lowercase,
                TokenFilterName.Phonetic
            }
        }
    }
};

Answer 1

以下是您可以执行此操作的方法:

• 添加自定义分析器，如下所示:

{
  "name":"names",
  "fields":[
    { "name":"id", "type":"Edm.String", "key":true, "searchable":false },
    { "name":"name", "type":"Edm.String", "analyzer":"my_standard" }
  ],
  "analyzers":[
    {
      "name":"my_standard",
      "@odata.type":"#Microsoft.Azure.Search.CustomAnalyzer",
      "tokenizer":"standard",
      "tokenFilters":[ "lowercase", "asciifolding" ]
    }
  ]
}

// Below snippet is for creating definition using c#
new CustomAnalyzer
                {
                    Name = "custom_analyzer",
                    Tokenizer = TokenizerName.Standard,
                    TokenFilters = new[]
                    {
                        TokenFilterName.Lowercase,
                        TokenFilterName.AsciiFolding,
                        TokenFilterName.Phonetic
                    }
                }

• 然后在创建文档定义时引用自定义分析器，如下所示:

    [IsSearchable, IsFilterable, IsSortable, Analyzer("custom_analyzer")]
    public string Property { get; set; }

查看此博客以获取更多引用:

https://azure.microsoft.com/en-in/blog/custom-analyzers-in-azure-search/

这是自定义分析仪的示例测试方法:

[Fact]
        public void CanSearchWithCustomAnalyzer()
        {
            Run(() =>
            {
                const string CustomAnalyzerName = "my_email_analyzer";
                const string CustomCharFilterName = "my_email_filter";

                Index index = new Index()
                {
                    Name = SearchTestUtilities.GenerateName(),
                    Fields = new[]
                    {
                        new Field("id", DataType.String) { IsKey = true },
                        new Field("message", (AnalyzerName)CustomAnalyzerName) { IsSearchable = true }
                    },
                    Analyzers = new[]
                    {
                        new CustomAnalyzer()
                        {
                            Name = CustomAnalyzerName,
                            Tokenizer = TokenizerName.Standard,
                            CharFilters = new[] { (CharFilterName)CustomCharFilterName }
                        }
                    },
                    CharFilters = new[] { new PatternReplaceCharFilter(CustomCharFilterName, "@", "_") }
                };

                Data.GetSearchServiceClient().Indexes.Create(index);

                SearchIndexClient indexClient = Data.GetSearchIndexClient(index.Name);

                var documents = new[]
                {
                    new Document() { { "id", "1" }, { "message", "My email is <a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c7b4a8aaa2a8a9a287b4a8aaa2b0afa2b5a2e9b4a8aaa2b3afaea9a0" rel="noreferrer noopener nofollow">[email protected]</a>." } },
                    new Document() { { "id", "2" }, { "message", "His email is <a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="493a26242c26272c0927263e212c3b2c6727263d2120272e" rel="noreferrer noopener nofollow">[email protected]</a>." } },
                };

                indexClient.Documents.Index(IndexBatch.Upload(documents));
                SearchTestUtilities.WaitForIndexing();

                DocumentSearchResult<Document> result = indexClient.Documents.Search("<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="c8bba7a5ada7a6ad88bba7a5adbfa0adbaade6bba7a5adbca0a1a6af" rel="noreferrer noopener nofollow">[email protected]</a>");

                Assert.Equal("1", result.Results.Single().Document["id"]);
            });
        }

欢迎在对话中标记我，希望对您有所帮助。