Python RegExp-如何删除空间

您使用的

[…]

语法不正确；这是一个字符类，一组可以匹配的字符。该类中列出的任何一个字符都是匹配的，因此要么是空格，要么是

（

字符，要么是

P

或

）

；那个空间会很好

使用非捕获组（而不是字符类）使额外文本成为可选文本，并为您想要的零件使用捕获组：

s = "LEV606 (P), LEV230 (P)"
#Expected result: ['LEV606', 'LEV230']

# First attempt
In [3]: re.findall(r"[A-Z]{3}[0-9]{3}[ \(P\)]?", s)
Out[3]: ['LEV606 ', 'LEV230 ']

# Second attempt. The 'P' is not mandatory, can be other letter.
# Why this doesn't work?
In [4]: re.findall(r"[A-Z]{3}[0-9]{3}[ \([A-Z]{1}\)]?", s)
Out[4]: []

# Third attempt
# White space is still there. Why? I want to remove it from the answer
In [5]: re.findall(r"[A-Z]{3}[0-9]{3}[\s\(\w\)]?", s)
Out[5]: ['LEV606 ', 'LEV230 ']

演示：

re.findall(r"([A-Z]{3}[0-9]{3})(?: \(P\))?", s)

>>> import re
>>> s = "LEV606 (P), LEV230 (P)"
>>> re.findall(r"([A-Z]{3}[0-9]{3})(?: \(P\))?", s)
['LEV606', 'LEV230']