# Lowercase Tokenizer (小寫分詞器) **`lowercase`****?tokenizer**(小寫分詞器)，類似于??**[`letter`?tokenizer](https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-letter-tokenizer.html "Letter Tokenizer")?**，遇到非字母時分割文本，并將所有分割后的詞元轉為小寫。功能上等同于?**?[`letter`?tokenizer](https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-letter-tokenizer.html "Letter Tokenizer")**?+??**[`lowercase`?token filter](https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-lowercase-tokenfilter.html "Lowercase Token Filter")**?，但是由于單次執行了所有步驟，所以效率更高。 原文鏈接 : [https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-lowercase-tokenizer.html](https://www.elastic.co/guide/en/elasticsearch/reference/5.4/analysis-lowercase-tokenizer.html) 譯文鏈接 : [http://www.apache.wiki/pages/viewpage.action?pageId=10028862](http://www.apache.wiki/pages/viewpage.action?pageId=10028862) 貢獻者 : [陳益雷](/display/~chenyilei)，[ApacheCN](/display/~apachecn)，[Apache中文網](/display/~apachechina) ## **輸出示例** ``` POST _analyze { "tokenizer": "lowercase", "text": "The 2 QUICK Brown-Foxes jumped over the lazy dog's bone." } ``` 上面的句子會生成如下的詞元: ``` [ the, quick, brown, foxes, jumped, over, the, lazy, dog, s, bone ] ``` ## **配置** **`lowercase`****?tokenizer**(小寫分詞器)?不支持配置。