# 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。 ## **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。