下划线在python中不算作非字母数字字符吗？

Question

import re

x = "dkvn_i45"

if re.search(r"\W", x):
  print("Yes")
else: 
  print("No")

>>> No

我很困惑，因为下划线既不是数字也不是字母，所以它肯定会算作非字母数字字符吗？你知道吗

Answer 1

医生？https://docs.python.org/3/library/re.html

\W
Matches any character which is not a word character. This is the opposite of \w. If the ASCII flag is used this becomes the equivalent of [^a-zA-Z0-9_]. If the LOCALE flag is used, matches characters which are neither alphanumeric in the current locale nor the underscore.

（简而言之：否，\W与_不匹配）