Javascript 密码验证的正则表达式

Regular Expression for password validation

提问by Andromeda

can any one help me in creating a regular expression for password validation.

任何人都可以帮助我创建用于密码验证的正则表达式。

The Condition is "Password must contain 8 characters and at least one number, one letter and one unique character such as !#$%&? "

条件是“密码必须包含 8 个字符和至少一个数字、一个字母和一个唯一字符，例如 !#$%&? "

回答by Macmade

^.*(?=.{8,})(?=.*[a-zA-Z])(?=.*\d)(?=.*[!#$%&? "]).*$

---

^.*              : Start
(?=.{8,})        : Length
(?=.*[a-zA-Z])   : Letters
(?=.*\d)         : Digits
(?=.*[!#$%&? "]) : Special characters
.*$              : End

回答by Rohit Dubey

Try this

尝试这个

((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[\W]).{6,20})

Description of above Regular Expression:

上述正则表达式说明：

(           # Start of group
  (?=.*\d)      #   must contains one digit from 0-9
  (?=.*[a-z])       #   must contains one lowercase characters
  (?=.*[\W])        #   must contains at least one special character
              .     #     match anything with previous condition checking
                {8,20}  #        length at least 8 characters and maximum of 20 
)           # End of group

"/W" will increase the range of characters that can be used for password and pit can be more safe.

“/W”会增加可用于密码的字符范围，坑会更安全。

回答by Richard

You can achieve each of the individual requirements easily enough (e.g. minimum 8 characters: .{8,}will match 8 or more characters).

您可以很容易地满足每个单独的要求（例如，最少 8 个字符：.{8,}将匹配 8 个或更多字符）。

To combine them you can use "positive lookahead" to apply multiple sub-expressions to the same content. Something like (?=.*\d.*).{8,}to match one (or more) digits with lookahead, and 8 or more characters.

要组合它们，您可以使用“正向前瞻”将多个子表达式应用于相同的内容。类似于(?=.*\d.*).{8,}将一个（或多个）数字与前瞻匹配，以及 8 个或更多字符。

So:

所以：

(?=.*\d.*)(?=.*[a-zA-Z].*)(?=.*[!#$%&\?].*).{8,}

Remembering to escape meta-characters.

记住要转义元字符。

回答by Nasif Md. Tanjim

Password with the following conditions:

具有以下条件的密码：

1. At least 1 digit
2. At least 2 special characters
3. At least 1 alphabetic character

4. No blank space

   'use strict';
   (function() {
       var foo = '3g^g$';
   
       console.log(/^(?=.*\d)(?=(.*\W){2})(?=.*[a-zA-Z])(?!.*\s).{1,15}$/.test(foo));
   
       /**
        * (?=.*\d)         should contain at least 1 digit
        * (?=(.*\W){2})    should contain at least 2 special characters
        * (?=.*[a-zA-Z])   should contain at least 1 alphabetic character
        * (?!.*\s)         should not contain any blank space
        */
   })();
   

1. 至少 1 位数字
2. 至少 2 个特殊字符
3. 至少 1 个字母字符

4. 没有空格

   'use strict';
   (function() {
       var foo = '3g^g$';
   
       console.log(/^(?=.*\d)(?=(.*\W){2})(?=.*[a-zA-Z])(?!.*\s).{1,15}$/.test(foo));
   
       /**
        * (?=.*\d)         should contain at least 1 digit
        * (?=(.*\W){2})    should contain at least 2 special characters
        * (?=.*[a-zA-Z])   should contain at least 1 alphabetic character
        * (?!.*\s)         should not contain any blank space
        */
   })();
   

回答by Ujjaval

You can make your own regular expression for javascriptvalidations;

您可以制作自己的正则表达式进行javascript验证；

        (/^
        (?=.*\d)                //should contain at least one digit
        (?=.*[a-z])             //should contain at least one lower case
        (?=.*[A-Z])             //should contain at least one upper case
        [a-zA-Z0-9]{8,}         //should contain at least 8 from the mentioned characters

        $/)

Example:- /^(?=.*\d)(?=.*[a-zA-Z])[a-zA-Z0-9]{7,}$/

例子：- /^(?=.*\d)(?=.*[a-zA-Z])[a-zA-Z0-9]{7,}$/