为什么正则表达式搜索返回 None 相同的字符串？

Question

这段代码returnsNone，我做错了什么？我假设它与特殊字符有关

test=re.search('The Girl Who Played with Fire (Millennium #2)', 'The Girl Who Played with Fire (Millennium #2)',re.IGNORECASE)
print(test)

Answer 1

当字符串用作模式时，括号被视为分组运算符。

试试这个：

test=re.search(
    'The Girl Who Played with Fire [(]Millennium #2[)]',
    'The Girl Who Played with Fire (Millennium #2)',
    re.IGNORECASE
)

Answer 2

您必须在正则表达式中转义 ( 和 )：

test=re.search(
   'The Girl Who Played with Fire \(Millennium #2\)', # <- NOTICE
   'The Girl Who Played with Fire (Millennium #2)',
   re.IGNORECASE)
print(test)

为什么正则表达式搜索返回 None 相同的字符串？

Why is regex search returning None for the same string?

python

regex

python-re