密碼復雜性的正則表達式

Question

我試圖通過客戶端（JavaScript）和服務器端（ASP.NET C＃）上的正則表達式實現密碼復雜性的實施。

規則如下：

• 必須是8-40個字符
• 必須至少包含一位數字
• 必須至少包含一個小寫字母
• 必須包含至少一個大寫字母
• 必須至少包含一個特殊字符

你能幫忙構建一下驗證上述所需的正則表達式嗎？

Answer 1

試試這個正則表達式：

((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{8,40})

(           # Start of group
  (?=.*\d)      #   must contains one digit from 0-9
  (?=.*[a-z])       #   must contains one lowercase characters
  (?=.*[A-Z])       #   must contains one uppercase characters
  (?=.*[@#$%])      #   must contains one special symbols in the list "@#$%"
              .     #     match anything with previous condition checking
                {8,40}  #        length at least 8 characters and maximum of 40 
)