用regex python [duplicate]提取子字符串

This question already has an answer here:

这个问题在这里已有答案:

• What is the difference between re.search and re.match? 7 answers

re.search和re.match有什么区别? 7个答案

I know this is a very frequently asked question, but it's driving me mad.

我知道这是一个非常常见的问题,但这让我很生气。

I want to use regex to match a substring in my string.

我想使用正则表达式匹配我的字符串中的子字符串。

 line = '##ParameterValue[part I care about]=garbagegarbage'

And I would like to extract the part I care about. My code looks like this:

我想提取我关心的部分。我的代码如下所示:

import re
line = '##ParameterValue[part I care about]=garbagegarbage'
m = re.match('\[(.*)\]', line)
print m.group(1)

But this gives me an AttributeError: 'NoneType' object has no attribute 'group'

但这给了我一个AttributeError:'NoneType'对象没有属性'group'

I tested my regex on regex101 and it works. I don't understand why this fails for me.

我在regex101上测试了我的正则表达式并且它有效。我不明白为什么这对我失败了。

1 个解决方案

#1

Change match to search

将匹配更改为搜索

import re
line = '##ParameterValue[part I care about]=garbagegarbage'
m = re.search('\[(.*)\]', line)
print m.group(1)