提取搜索词周围的词 [英] Extract words surrounding a search word

问题描述

我有这个脚本可以在文本中搜索单词.搜索进行得非常好，结果按预期工作.我要达到的目标是提取匹配附近的n单词.例如:

I have this script that does a word search in text. The search goes pretty good and results work as expected. What I'm trying to achieve is extract n words close to the match. For example:

这个世界很小，我们应该努力照顾它.

The world is a small place, we should try to take care of it.

假设我正在寻找place，我需要提取右侧的3个单词和左侧的3个单词.在这种情况下，它们将是:

Suppose I'm looking for place and I need to extract the 3 words on the right and the 3 words on the left. In this case they would be:

left -> [is, a, small]
right -> [we, should, try]

执行此操作的最佳方法是什么?

What is the best approach to do this?

谢谢！

推荐答案

def search(text,n):
    '''Searches for text, and retrieves n words either side of the text, which are retuned seperatly'''
    word = r"\W*([\w]+)"
    groups = re.search(r'{}\W*{}{}'.format(word*n,'place',word*n), text).groups()
    return groups[:n],groups[n:]

这使您可以指定要捕获的任一侧的单词数.它通过动态构造正则表达式来工作.使用

This allows you to specify how many words either side you want to capture. It works by constructing the regular expression dynamically. With

t = "The world is a small place, we should try to take care of it."
search(t,3)
(('is', 'a', 'small'), ('we', 'should', 'try'))

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