我必须制作一个正则表达式并且无法弄清楚语法

Question

正则表达式的规则是：至少 8 个字符，至少使用以下之一：(&%$^#@=)，至少有 2 个既不在开头也不在结尾的数字 NOR它们在密码内是否可以相邻，至少有 2 个大写和 2 个小写字符。这就是我到目前为止所拥有的。我不知道如何使正则表达式不在乎字符的顺序。我也不知道如何使整个事情需要 8 个字符。

/^[&%$^#@=]{1,}.[0-9(?!0-9)0-9(?!\s)]{2,}[A-Z]{2,}[a-z]{2,}$/;

Answer 1

这个经过测试的 JavaScript 函数包括一个符合您的验证要求的带注释的正则表达式：

function valid_password(text) {
    /*#!(?#!js re_password Rev:20160409_0700)
        # Password validation with multiple requirements.
        ^                         # Anchor to start of string.
        (?=[^&%$^#@=]*[&%$^#@=])  # Use at least one (&%$^#@=).
        (?=(?:\D*\d){2})          # Have at least 2 numbers.
        (?!\d)                    # Numbers not at the beginning.
        (?!.*\d$)                 # Numbers not at the end.
        (?=\D*(?:\d\D+)+$)        # Numbers not next to each other.
        (?=(?:[^A-Z]*[A-Z]){2})   # At least 2 uppercase.
        (?=(?:[^a-z]*[a-z]){2})   # At least 2 lowercase.
        .{8,}                     # Be at least 8 characters.
        $                         # Anchor to end of string.
    !#*/
    var re_password = /^(?=[^&%$^#@=]*[&%$^#@=])(?=(?:\D*\d){2})(?!\d)(?!.*\d$)(?=\D*(?:\d\D+)+$)(?=(?:[^A-Z]*[A-Z]){2})(?=(?:[^a-z]*[a-z]){2}).{8,}$/;
    if (text.match(re_password)) { return true; }
    return false;
}

请注意，此正则表达式演示了如何在位于字符串开头的位置应用多个 AND 逻辑条件。另请注意，上述正则表达式中数字要求的多个条件可以合并为一个断言 - 它们在此处以详细（多断言样式）呈现，以演示所使用的技术。

希望这会有所帮助！

Answer 2

这个正则表达式似乎有效

(?=^.{8,}$)(?!^\d)(?!.*\d$)(?!.+\d\d)(?=.*[&%$^#@=])(?=(.*[A-Z]){2})(?=(.*[a-z]){2})(?=(.*[0-9]){2})

Regex Demo

正则表达式分解

(?=^.{8,}$) #Positive look ahead to check whether there are at least 8 characters
(?!^\d) #Negative look ahead to check that string does not begin with a digit
(?!.*\d$) #Negative look ahead to check that string does not end with a digit
(?!.+\d\d) #Negative look ahead to check that string does not have two consecutive digits
(?=.*[&%$^#@=]) #Positive look ahead to check that string have at least any of the characters present in character class
(?=(.*[A-Z]){2}) #Positive look ahead to check that string contains at least two Upper Case characters
(?=(.*[a-z]){2}) #Positive look ahead to check that string contains at least two Lower Case characters
(?=(.*[0-9]){2}) #Positive look ahead to check that string contains at least two digits