Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Welcome To Ask or Share your Answers For Others

Categories

0 votes
564 views
in Technique[技术] by (71.8m points)

python - Extract words surrounding a search word

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:

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

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]

What is the best approach to do this?

Thanks!

See Question&Answers more detail:os

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
Welcome To Ask or Share your Answers For Others

1 Reply

0 votes
by (71.8m points)
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:]

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'))

与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…
OGeek|极客中国-欢迎来到极客的世界,一个免费开放的程序员编程交流平台!开放,进步,分享!让技术改变生活,让极客改变未来! Welcome to OGeek Q&A Community for programmer and developer-Open, Learning and Share
Click Here to Ask a Question

...