HTML Strip Character Filter

• 將html元素替換成對應的解碼值（例如&替換成&)。
• 示例

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

I'm so happy!

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keyword換成standard產生[ I'm,so,happy ]。

• 配置引數

示例

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

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

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Mapping Character Filter

• 定義一堆鍵值對，匹配到鍵就替換成值。
• 配置引數

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"
      ]
    }
  ],"text": "My license plate is ٢٥٠١٥"
}
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產生[ My license plate is 25015 ]。

上一個例子是單字元的替換，也可以多字元。

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

Pattern Replace Character Filter

• 使用正則表示式去替換。替換文字可以引用捕獲組中的內容。
• 配置引數

示例

POST _analyze
{
  "char_filter": [
    {
      "type": "pattern_replace","pattern": "(\\d+)-(?=\\d)","replacement": "$1_"
    }
  ],"text": "My credit card is 123-456-789"
}
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產生[ My credit card is 123_456_789 ]。