如何检查没有紧跟关键字的词，没有被关键字包围的词呢？

Question

我正在尝试查找未紧接在 the 之前的词。

执行正面回溯以获取关键字 'the' (?<=the\W) 之后的词。但是，我无法捕获 'people' 和 'that'，因为上述逻辑不适用于这些情况。

我无法处理前后没有关键字'the'的词（例如句子中的'that'和'people'）

p = re.compile(r'(?<=the\W)\w+') 
m = p.findall('the part of the fair that attracts the most people is the fireworks')

print(m)

当前得到的输出是

'part','fair','most','fireworks'.

编辑：

感谢您在下方提供的所有帮助。使用评论中的以下建议，设法更新我的代码。

p = re.compile(r"\b(?!the)(\w+)(\W\w+\Wthe)?")
m = p.findall('the part of the fair that attracts the most people is the fireworks')

这让我更接近我需要得到的输出。

更新后的输出：

[('part', ' of the'), ('fair', ''),
 ('that', ' attracts the'), ('most', ''),
 ('people', ' is the'), ('fireworks', '')]

我只需要字符串 ('part','fair','that','most','people','fireworks')。有什么建议吗？

Answer 1

I am trying to look for words that do not immediately come before 'the' .

注意下面的代码没有使用re.

words = 'the part of the fair that attracts the most people is the fireworks'
words_list = words.split()
words_not_before_the = []
for idx, w in enumerate(words_list):
    if idx < len(words_list)-1 and words_list[idx + 1] != 'the':
        words_not_before_the.append(w)
words_not_before_the.append(words_list[-1])
print(words_not_before_the)

输出

['the', 'part', 'the', 'fair', 'that', 'the', 'most', 'people', 'the', 'fireworks']

Answer 2

尝试旋转它，而不是找出没有紧跟在 the 之后的词，消除所有紧跟在 the

之后的词

import re
test = "the part of the fair that attracts the most people is the fireworks"
pattern = r"\s\w*\sthe|the\s"
print(re.sub(pattern, "", test))

输出：part fair that most people fireworks

Answer 3

使用正则表达式：

import re
m = re.sub(r'\b(\w+)\b the', 'the', 'the part of the fair that attracts the most people is the fireworks')
print([word for word in m.split(' ') if not word.isspace() and word])

输出：

['the', 'part', 'the', 'fair', 'that', 'the', 'most', 'people', 'the', 'fireworks']

Answer 4

I am trying to look for words that do not immediately come before the.

试试这个：

import re

# The capture group (\w+) matches a word, that is followed by a word, followed by the word: "the"
p = re.compile(r'(\w+)\W\w+\Wthe')
m = p.findall('the part of the fair that attracts the most people is the fireworks')
print(m)

输出：

['part', 'that', 'people']

Answer 5

我终于解决了这个问题。谢谢大家！

p = re.compile(r"\b(?!the)(\w+)(?:\W\w+\Wthe)?")
m = p.findall('the part of the fair that attracts the most people is the fireworks')
print(m)

在第三组中添加了一个 non-capturing 组 '?:'。

输出：

['part', 'fair', 'that', 'most', 'people', 'fireworks']

如何检查没有紧跟关键字的词，没有被关键字包围的词呢？

How to check for words that are not immediately followed by a keyword, how about words not surrounded by the keyword?

python

lookbehind

python-re