Elasticsearch Character filters reference 字符过滤器

心已赠人 2023-02-18 05:26 5阅读 0赞

#### Html strip character filter ####

默认替换掉所有的标记文本

GET /_analyze
    {
        
      "tokenizer": "keyword",
      "char_filter": [
        "html_strip"
      ],
      "text": "<p>I'm so <b>happy</b>!</p>"
    }

##### 自定义 #####

忽略b标签，删除其他标签

PUT my_index
    {
        
      "settings": {
        
        "analysis": {
        
          "analyzer": {
        
            "my_analyzer": {
        
              "tokenizer": "keyword",
              "char_filter": [
                "my_custom_html_strip_char_filter"
              ]
            }
          },
          "char_filter": {
        
            "my_custom_html_strip_char_filter": {
        
              "type": "html_strip",
              "escaped_tags": [
                "b"
              ]
            }
          }
        }
      }
    }

#### Mapping character filter ####

GET /_analyze
    {
        
      "tokenizer": "keyword",
      "char_filter": [
        {
        
          "type": "mapping",
          "mappings": [
            "٠ => 0",
            "١ => 1",
            "٢ => 2",
            "٣ => 3",
            "٤ => 4",
            "٥ => 5",
            "٦ => 6",
            "٧ => 7",
            "٨ => 8",
            "٩ => 9"
          ]
        }
      ],
      "text": "My license plate is ٢٥٠١٥"
    }
    /*输出结果*/
    [ My license plate is 25015 ]

##### 自定义 #####

`:)` 替换成 `_happy_`， `:(` 替换成`_sad_`

PUT /my_index
    {
        
      "settings": {
        
        "analysis": {
        
          "analyzer": {
        
            "my_analyzer": {
        
              "tokenizer": "standard",
              "char_filter": [
                "my_mappings_char_filter"
              ]
            }
          },
          "char_filter": {
        
            "my_mappings_char_filter": {
        
              "type": "mapping",
              "mappings": [
                ":) => _happy_",
                ":( => _sad_"
              ]
            }
          }
        }
      }
    }

#### 正则表达式字符过滤器 ####

正则表达式字符过滤器使用一个正则表达式匹配应该与指定替换字符串替换字符。替换字符串可以引用正则表达式中的捕获组。

PUT my_index
    {
        
      "settings": {
        
        "analysis": {
        
          "analyzer": {
        
            "my_analyzer": {
        
              "tokenizer": "standard",
              "char_filter": [
                "my_char_filter"
              ],
              "filter": [
                "lowercase"
              ]
            }
          },
          "char_filter": {
        
            "my_char_filter": {
        
              "type": "pattern_replace",
              "pattern": "(?<=\\p{Lower})(?=\\p{Upper})",
              "replacement": " "
            }
          }
        }
      },
      "mappings": {
        
        "properties": {
        
          "text": {
        
            "type": "text",
            "analyzer": "my_analyzer"
          }
        }
      }
    }
    
    POST my_index/_analyze
    {
        
      "analyzer": "my_analyzer",
      "text": "The fooBarBaz method"
    }
    /*输出*/
    [ the, foo, bar, baz, method ]