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                # Character Filters(字符過濾器) **Character**?**filters**(字符過濾器)用于字符流傳遞到分詞器(**tokenizer**)之前對它進行預處理。 一個?**Character**?**filters**(字符過濾器)接收原始文本作為字符流,通過**adding**(添加),**removing**(刪除)或?**changing**?(更改)字符來轉換流。例如,可以使用字符過濾器將?**Arabic numerals**(阿拉伯數字)(**?????????????**)轉換為和它等價的?**Latin**(拉丁數字)(**0123456789**),也可以用于從字符流中剝離****?等?**HTML**?元素。 **Elasticsearch**?內置了許多的?**character**?**filters**(字符過濾器),可以用來構建?[custom analyzers](https://www.elastic.co/guide/en/elasticsearch/reference/5.3/analysis-custom-analyzer.html "Custom Analyzer")(自定義分詞器)。 [HTML Strip Character Filter](http://cwiki.apachecn.org/display/Elasticsearch/HTML+Strip+Character+Filter) 該?**html_strip**?字符串過濾器可以刪除類似**?**?的?**HTML**?元素和解碼類似于?**&amp**?這樣的?**HTML**?實體。 [Mapping Character Filter](http://cwiki.apachecn.org/display/Elasticsearch/Mapping+Character+Filter) 該?**mapping**?字符串過濾器可以將所有指定的字符串替換成特定的字符串。 [Pattern Replace Character Filter](http://cwiki.apachecn.org/display/Elasticsearch/Pattern+Replace+Character+Filter) 該?**pattern_replace**?字符串過濾器可以將滿足正則表達式的所有字符串替換成特定的字符串
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