删除除了数字内标点之外的标点符号

Question

有没有办法删除字符串中的所有标点符号，但保留连字符和数字内的标点符号？

Hello! this episode is thirty-five minutes long, 35.26 mins to be precise.

应该是：

Hello this episode is thirty-five minutes long 35.26 mins to be precise

Answer 1

您可以将re.sub与正向前瞻：

一起使用

In [165]: re.sub('\W(?=\s|$)', '', s)
Out[165]: 'Hello this episode is thirty-five minutes long 35.26 mins to be precise'

<强>详情

\W      # any character that is not a letter or digit
(?=     # positive lookahead
\s      # whitespace
|       # regex OR
$       # EOL
)

Answer 2

使用较新的regex模块可以实现变体：

\w+[-.]+\w+(*SKIP)(*FAIL)|[!,.]+

细分：

\w+[-.]+\w+    # 1+ word characters, followed by - or ., another 1+ wc
(*SKIP)(*FAIL) # all of these shall fail
|              # or
[!,.]+         # one of !,. but possibly more

见a demo on regex101.com。

<小时/> 在Python：

import regex as re

string = "Hello! this episode is thirty-five minutes long, 35.26 mins to be precise."

rx = re.compile(r'\w+[-.]+\w+(*SKIP)(*FAIL)|[!,.]+')
string = rx.sub('', string)
print(string)
# Hello this episode is thirty-five minutes long 35.26 mins to be precise