python - 查找子字符串周围的单词

Question

我必须在一个大字符串中提取我的子字符串匹配前后的两个词。例如:

sub = 'name'

str = '''My name is Avi. Name identifies who you are. It is important to have a name starting with the letter A.'''

现在我必须找到 str 中出现的所有 sub，然后返回以下内容:

(My name is Avi), (Name identifies who), (have a name starting with)

请注意，如果 re 是字符串之后的句号，那么只会返回字符串之前的单词，如上例所示。

我试过什么？

>>> import re
>>> text = '''My name is Avi. Name identifies who you are. It is important to have a name starting with the letter A.'''
>>> for m in re.finditer( 'name', text ):
...     print( 'name found', m.start(), m.end() )

这给了我匹配子串的开始和结束位置。我无法进一步了解如何在它周围找到单词。

Answer 1

import re
sub = '(\w*)\W*(\w*)\W*(name)\W*(\w*)\W*(\w*)'
str1 = '''My name is Avi. Name identifies who you are. It is important to have a name starting with the letter A.'''
for i in re.findall(sub, str1, re.I):
    print " ".join([x for x in i if x != ""])

输出

My name is Avi
Name identifies who
have a name starting with

或者，

sub = '\w*\W*\w*\W*name\W*\w*\W*\w*'
for i in re.findall(sub, str1, re.I):
    i=i.strip(" .")
    print i