强制执行复杂密码的正则表达式，匹配 4 条规则中的 3 条 [英] Regular expression to enforce complex passwords, matching 3 out of 4 rules

问题描述

我有以下标准来为符合以下规则的密码创建正则表达式:

I have the following criteria for creating a regular expression for a password that conforms to the following rules:

1. 密码长度必须为 8 个字符(我可以这样做:-)).

密码必须包含以下 4 条规则中至少 3 条的字符:

The password must then contain characters from at least 3 of the following 4 rules:

1. 大写
2. 小写
3. 数字
4. 非字母数字

我可以使用以下表达式使表达式匹配所有这些规则:

I can make the expression match ALL of those rules with the following expression:

/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.[\W]).{8,}$/

但我正在努力解决如何做到这一点，只需要解决 4 条规则中的任何 3 条.

But I am struggling with how to do this in such a way that it only needs to solve any 3 of the 4 rules.

谁能帮我解决这个问题?

Can anyone help me out with this?

推荐答案

然后不要使用一个正则表达式来检查它.

Don't use one regex to check it then.

if (password.length < 8)
  alert("bad password");
var hasUpperCase = /[A-Z]/.test(password);
var hasLowerCase = /[a-z]/.test(password);
var hasNumbers = /\d/.test(password);
var hasNonalphas = /\W/.test(password);
if (hasUpperCase + hasLowerCase + hasNumbers + hasNonalphas < 3)
  alert("bad password");

<小时>

如果您必须使用单个正则表达式:

---

If you must use a single regex:

^(?:(?=.*[a-z])(?:(?=.*[A-Z])(?=.*[\d\W])|(?=.*\W)(?=.*\d))|(?=.*\W)(?=.*[A-Z])(?=.*\d)).{8,}$

此正则表达式未针对效率进行优化.它由A·B·C + A·B·D + A·C·D + B·C·D 和一些因式分解构造而成.细分:

This regex is not optimized for efficiency. It is constructed by A·B·C + A·B·D + A·C·D + B·C·D with some factorization. Breakdown:

^
(?:
    (?=.*[a-z])       # 1. there is a lower-case letter ahead,
    (?:               #    and
        (?=.*[A-Z])   #     1.a.i) there is also an upper-case letter, and
        (?=.*[\d\W])  #     1.a.ii) a number (\d) or symbol (\W),
    |                 #    or
        (?=.*\W)      #     1.b.i) there is a symbol, and
        (?=.*\d)      #     1.b.ii) a number ahead
    )
|                     # OR
    (?=.*\W)          # 2.a) there is a symbol, and
    (?=.*[A-Z])       # 2.b) an upper-case letter, and
    (?=.*\d)          # 2.c) a number ahead.
)
.{8,}                 # the password must be at least 8 characters long.
$

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