如何在 Python 中测试正则表达式密码?

问题描述

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:

• 至少 8 个字符
• 必须限于，但不具体要求:
  • 大写字母:A-Z
  • 小写字母:a-z
  • 数字:0-9
  • 任何特殊字符:@#$%^&+=

  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.

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