# Word Delimiter Token Filter(Word Delimiter 词元过滤器)
命名为 word_delimiter,它将单词分解为子词,并对子词组进行可选的转换。 词被分为以下规则的子词:
* 拆分字内分隔符(默认情况下,所有非字母数字字符)。.
* "Wi-Fi" → "Wi", "Fi"
* 按大小写转换拆分: "PowerShot" → "Power", "Shot"
* 按字母数字转换拆分: "SD500" → "SD", "500"
* 每个子词的前导和尾随的词内分隔符都被忽略: "//hello---there, *dude*" → "hello", "there", "dude"
* 每个子词都删除尾随的“s”: "O’Neil’s" → "O", "Neil"
参数包括:
**generate_word_parts**
**true** 导致生成单词部分:"PowerShot" ⇒ "Power" "Shot"。默认 **true**
**generate_number_parts**
**true **导致生成数字子词:"500-42" ⇒ "500" "42"。默认 **true**
**catenate_numbers**
****true ****导致单词最大程度的链接到一起:"wi-fi" ⇒ "wifi"。默认 **false**
**catenate_numbers**
******true ******导致数字最大程度的连接到一起:"500-42" ⇒ "50042"。默认 **false**
**catenate_all**
********true ********导致所有的子词可以连接:"wi-fi-4000" ⇒ "wifi4000"。默认 **false**
**split_on_case_change**
**true **导致 "PowerShot" 作为两个词元("Power-Shot" 作为两部分看待)。默认 **true**
**preserve_original**
**true **在子词中保留原始词: "500-42" ⇒ "500-42" "500" "42"。默认 **false**
**split_on_numerics**
**true **导致 "j2se" 成为三个词元: "j" "2" "se"。默认 **true**
**stem_english_possessive**
**true **导致每个子词中的 "'s" 都会被移除:"O’Neil’s" ⇒ "O", "Neil"。默认 **true**
高级设置:
**protected_words**
被分隔时的受保护词列表。 一个数组,或者也可以将**protected_words_path** 设置为配置有保护字的文件(每行一个)。 如果存在,则自动解析为基于 **config/** 位置的位置。
**type_table**
例如,自定义类型映射表(使用 **type_table_path** 配置时):
|
`# Map the $, %, ``'.'``, and ``','` `characters to DIGIT`
`# This might be useful ``for` `financial data.`
`$ => DIGIT`
`% => DIGIT`
`. => DIGIT`
`\\u002C => DIGIT`
`# in some cases you might not want to split on ZWJ`
`# ``this` `also tests the ``case` `where we need a bigger ``byte``[]`
`# see http:``//en.wikipedia.org/wiki/Zero-width_joiner`
`\\u200D => ALPHANUM`
|
**提示:**
使用像 **`standard`**** tokenizer** 的 **tokenizer** 可能会干扰 **catenate_ *** 和**preserve_original** 参数,因为原始字符串在分词期间可能已经丢失了标点符号。 相反,您可能需要使用 **`whitespace `tokenizer**。
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