正则表达式将强密码与两个或多个特殊字符匹配 [英] Regex match a strong password with two or more special characters

问题描述

我需要使用具有以下要求的javascript来匹配密码字段：

I need to regex match a password field using javascript with the following requirements:

• 至少15个字符


• 两个或多个小写字母


• 两个或更多大写字母


• 两个或更多个数字


• 以下两个或多个特殊字符：！@＃$％^& * -

• At least 15 characters
• two or more lower case letters
• two or more upper case letters
• two or more digits
• two or more of the following special characters: !@#$%^&*-

我有正则表达式照顾大多数情况：

I have a regex that takes care of MOST cases:

/^.*(?=.{15,})(?=.{2,}\d)(?=.{2,}[a-z])(?=.{2,}[A-Z])(?=.{2,}[\!\@\#\$\%\^\&\*\-]).*$/

这里的问题是符号，它适用于：

The problem here is with the symbols, it works with:

P@ssw0rdP@ssw0rd
Pssw0rdPssw0rd@@
Pssw0rd@@Pssw0rd

但不是：

@@Pssw0rdPssw0rd

我有一个随机密码生成器设置彻底测试这个，所以任何想法都非常感激。谢谢！

I have a random password generator set up to exhaustively test this, so any ideas are greatly appreciated. Thanks!

推荐答案

/^(?=(?:.*[a-z]){2})(?=(?:.*[A-Z]){2})(?=(?:.*\d){2})(?=(?:.*[!@#$%^&*-]){2}).{15,}$/

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你的前瞻是错误的。模式

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Your lookaheads are wrong. The pattern

(?=.{2,}[class])

表示匹配2个或更多字符（无论是什么字符），然后是所需类别的1个字符。这与您指定的所需类的2个或更多字符完全不同。

means to match 2 or more characters (no matter what characters), then followed by 1 character of the desired class. This is entirely different from "2 or more character of the desired class" you specified.

要正确测试文本中是否包含所需类的字符，请使用

To correctly test if a character of desired class is in the text, use

(?=.*[class])

因为你要检查两次，重复模式

and since you want to check it twice, repeat the pattern

(?=.*[class].*[class])
# equivalent to (?=(?:.*[class]){2})

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