正则表达式替换python中的多个标点符号

Question

I would like to find multiple occurrences of exclamation marks, question marks and periods (such as !!?! , ...? , ...! ) and replace them with just the final punctuation.

ie !?!?!? would become ?

and ....! would become !

Is this possible?

Answer 1

text = re.sub(r'[\?\.\!]+(?=[\?\.\!])', '', text)

That is, remove any sequence of ?!. characters that are going to be followed by another ?!. character.

[...] is a character class. It matches any character inside the brackets.

+ means "1 or more of these".

(?=...) is a lookahead. It looks to see what is going to come next in the string.

Answer 2

text = re.search('[.?!]*([.?!])', text).group(1)

这种方式的工作方式是括号创建一个捕获组 ，允许您通过group函数访问匹配的文本。