在 python 中使用正则表达式在冒号或括号后提取字符串

Question

输入：

Subject: Representation of Territories? (Was: Re: The $11,250,000,000,000 lunch)

output：

Representation of Territories

输入：

Subject: Re: Top Ten Responses to Ed's Top Ten Lists

output：

Top Ten Responses to Ed's Top Ten Lists

Answer 1

您可以使用可选的捕获组来执行此操作：

import re

text_1 = "Subject: Representation of Territories? (Was: Re: The $11,250,000,000,000 lunch)"
text_2 = "Subject: Re: Top Ten Responses to Ed's Top Ten Lists"

regex = re.compile(r"Subject:\s"
                   r"(?:\w{2}:\s)?"  # Optional capture group
                   r"((\w+[']?\w+?\s?)+\w)"
                   r"\??",
                   re.I
                   )

res_1 = re.search(regex, text_1).group(1)
res_2 = re.search(regex, text_2).group(1)

print(res_1)
print(res_2)

返回：

Representation of Territories
Top Ten Responses to Ed's Top Ten Lists

另外，根据评论中的要求：

text_3 = "Subject: Re: F<O>CUS/HEALTH: ONE PAYER SYSTEM B.S."
regex_3 = re.compile(r"(.*:\s)+(.*)")
res_3 = re.search(regex_3, text_3).group(2)
print(res_3)

返回：

ONE PAYER SYSTEM B.S.