HTML Strip Character Filter

• 将html元素替换成对应的解码值（例如&替换成&)。
• 示例

POST _analyze
{
  "char_filter": [
    "html_strip"
    ],
  "tokenizer": "keyword", 
  "text": "<p>I&apos;m so <b>happy</b>!</p>"
}

产生

I'm so happy!

keyword换成standard产生[ I'm, so, happy ]。

• 配置参数

示例

POST _analyze
{
    "char_filter": [
       {
         "type": "html_strip",
         "escaped_tags":["b"]
       }
      ],
    "tokenizer": "keyword", 
    "text": "<p>I&apos;m so <b>happy</b>!</p>"
}

产生

I'm so <b>happy</b>!

Mapping Character Filter

• 定义一堆键值对，匹配到键就替换成值。
• 配置参数

示例

POST _analyze
{
  "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"
      ]
    }
  ], 
  "tokenizer": "keyword",
  "text": "My license plate is ٢٥٠١٥"
}

产生[ My license plate is 25015 ]。

上一个例子是单字符的替换，也可以多字符。

POST _analyze
{
  "char_filter": [
    {
      "type": "mapping",
      "mappings": [
        ":) => _happy_",
        ":( => _sad_"
      ]
    }
  ], 
  "tokenizer": "keyword",
  "text": "I'm delighted about it :("
}

产生[ I'm delighted about it _sad_ ]。

Pattern Replace Character Filter

• 使用正则表达式去替换。替换文本可以引用捕获组中的内容。
• 配置参数

示例

POST _analyze
{
  "char_filter": [
    {
      "type": "pattern_replace",
      "pattern": "(\\d+)-(?=\\d)",
      "replacement": "$1_"
    }
  ],
  "tokenizer": "keyword",
  "text": "My credit card is 123-456-789"
}

产生[ My credit card is 123_456_789 ]。