Question

我已经编写了这个正则表达式，我需要针对Java中的一组规则进行测试。规则是：

至少一个大写字母（A-Z）
至少一个小写字符（a-z）
至少一位数字（0-9）
至少一个特殊字符（标点符号）
密码不应以数字开头
密码不应以特殊字符结尾

这是我写过的正则表达式。 [a-zA-Z\w\D][a-zA-Z0-9\w][a-zA-Z0-9].$

它有时会起作用，有时它并不起作用。我无法弄清楚原因！我非常感谢你帮助我做到这一点。

Answer 1

试试这个：

Pattern pattern = Pattern.compile(
        "(?=.*[A-Z])" +  //At least one upper case character (A-Z)
                "(?=.*[a-z])" +     //At least one lower case character (a-z)
                "(?=.*\\d)" +   //At least one digit (0-9)
                "(?=.*\\p{Punct})" +  //At least one special character (Punctuation)
                "^[^\\d]" + // Password should not start with a digit
                ".*" +
                "[a-zA-Z\\d]$");   // Password should not end with a special character
Matcher matcher = pattern.matcher("1Sz1");
System.out.println(matcher.matches());

Answer 2

试试这个：

^[a-zA-Z@#$%^&+=](?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=]).{8,}[a-zA-Z0-9]$

说明：

^                 # start-of-string
[a-zA-Z@#$%^&+=]  # first digit letter or special character
(?=.*[0-9])       # a digit must occur at least once
(?=.*[a-z])       # a lower case letter must occur at least once
(?=.*[A-Z])       # an upper case letter must occur at least once
(?=.*[@#$%^&+=])  # a special character must occur at least once
.{8,}             # anything, at least eight places though
[a-zA-Z0-9]       # last digit letter or number
$                 # end-of-string

此模式可以轻松添加或删除规则。

这个答案的功劳归于以下两个主题：

Regexp Java for password validation

和

Regex not beginning with number

java中密码验证的正则表达式

2 个答案: