如何在 Python 中使用正则表达式排除特定字符串? [英] How to exclude specific string using regex in Python?

问题描述

我想匹配如下字符串:

45 meters?
45, meters?
45?
45 ?

但不是像这样的字符串:

but not strings like:

45 meters you?
45 you  ?
45, and you?

在这两种情况下，问号都必须在末尾.所以，基本上我想排除所有包含你"这个词的字符串.

In both cases the question mark must be at the end. So, essentially I want to exclude all those strings containing the word "you".

我尝试了以下正则表达式:

I've tried the following regex:

'\d+.*(?!you)\?$'

但它匹配第二种情况(可能是因为.*)

but it matches the second case (probably because of .*)

推荐答案

你可以试试这个正则表达式来匹配所有没有字符串 you 和 的行? 最后，

You could try this regex to match all the lines which doesn't have the string you with ? at the last,

^(?!.*you).*\?$

说明:

在这个正则表达式中使用了负前瞻.它实际上意味着什么，它检查包含字符串 you 的行.它匹配除包含字符串 you 的行之外的所有行.

A negative lookahead is used in this regex. What it does actually means, it checks for the lines which contains a string you. It matches all the lines except the line containing the string you.

演示

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