使用“但是"这个词和 RegEx 分块句子 [英] Chunking sentences using the word 'but' with RegEx

问题描述

我试图在单词但是"(或任何其他并列连词)上使用正则表达式对句子进行分块.它不起作用...

sentence = nltk.pos_tag(word_tokenize("没有大集合，但存在椎管狭窄."))结果 = nltk.RegexpParser(grammar).parse(sentence)DigDug = nltk.RegexpParser(r'CHUNK: {.*.*}')对于 DigDug.parse(sentence).subtrees() 中的子树:如果 subtree.label() == 'CHUNK': 打印(subtree.node())

我需要将句子没有大集合，但存在椎管狭窄." 一分为二:

<代码>1.目前没有大型收藏品"2.有椎管狭窄".

我还希望使用相同的代码在and"和其他并列连词 (CC) 词处拆分句子.但是我的代码不起作用.请帮忙.

解决方案

我认为你可以简单地做

导入重新结果 = re.split(r"\s+(?:but|and)\s+", 句子)

哪里

<块引用>

`\s` 匹配作为空白字符"的单个字符(空格、制表符、换行符等)`+` 一次和无限次之间，尽可能多次，按需回馈(贪婪)`(?:` 匹配下面的正则表达式，不捕获匹配以下任一正则表达式(仅当此选项失败时才尝试下一个选项)`but` 逐字匹配字符but"`|` 或者匹配下面第2个正则表达式(如果这个匹配失败，则整个组失败)`and` 逐字匹配字符and")`\s` 匹配作为空白字符"的单个字符(空格、制表符、换行符等)`+` 一次和无限次之间，尽可能多次，按需回馈(贪婪)

您可以在其中添加更多连接词，以管道字符 | 分隔.但请注意，这些单词不包含在正则表达式中具有特殊含义的字符.如果有疑问，请先使用 re.escape(word)

转义它们

I am attempting to chunk sentences using RegEx at the word 'but' (or any other coordinating conjunction words). It's not working...

sentence = nltk.pos_tag(word_tokenize("There are no large collections present but there is spinal canal stenosis."))
result = nltk.RegexpParser(grammar).parse(sentence)
DigDug = nltk.RegexpParser(r'CHUNK: {.*<CC>.*}')
for subtree in DigDug.parse(sentence).subtrees(): 
    if subtree.label() == 'CHUNK': print(subtree.node())

I need to split the sentence "There are no large collections present but there is spinal canal stenosis." into two:

1. "There are no large collections present"
2. "there is spinal canal stenosis."

I also wish to use the same code to split sentences at 'and' and other coordinating conjunction (CC) words. But my code isn't working. Please help.

解决方案

I think you can simply do

import re
result = re.split(r"\s+(?:but|and)\s+", sentence)

where

`\s`        Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.)
`+`         Between one and unlimited times, as many times as possible, giving back as needed (greedy)
`(?:`       Match the regular expression below, do not capture
            Match either the regular expression below (attempting the next alternative only if this one fails)
  `but`     Match the characters "but" literally
  `|`       Or match regular expression number 2 below (the entire group fails if this one fails to match)
  `and`     Match the characters "and" literally
)
`\s`        Match a single character that is a "whitespace character" (spaces, tabs, line breaks, etc.)
`+`         Between one and unlimited times, as many times as possible, giving back as needed (greedy)

You can add more conjunction words in there separated by a pipe-character |. Take care though that these words do not contain characters that have special meaning in regex. If in doubt, escape them first with re.escape(word)

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