在 Python 中使用正则表达式，我如何验证用户的密码是:

Using a regex in Python, how can I verify that a user's password is:

注意，所有字母/数字/特殊字符都是可选的.我只想验证密码长度是否至少为 8 个字符，并且仅限于字母/数字/特殊字符.如果他们愿意，用户可以选择更强/更弱的密码.到目前为止，我所拥有的是:

Note, all the letter/number/special chars are optional. I only want to verify that the password is at least 8 chars in length and is restricted to a letter/number/special char. It's up to the user to pick a stronger / weaker password if they so choose. So far what I have is:

import re
pattern = "^.*(?=.{8,})(?=.*d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).*$"
password = raw_input("Enter string to test: ")
result = re.findall(pattern, password)
if (result):
    print "Valid password"
else:
    print "Password not valid"

推荐答案

import re
password = raw_input("Enter string to test: ")
if re.fullmatch(r'[A-Za-z0-9@#$%^&+=]{8,}', password):
    # match
else:
    # no match

{8,} 表示至少 8 个"..fullmatch 函数要求整个字符串匹配整个正则表达式，而不仅仅是一部分.

The {8,} means "at least 8". The .fullmatch function requires the entire string to match the entire regex, not just a portion.