常规的前pression密码 [英] regular expression for password

问题描述

请能有人给我密码定期EX pression以下规则。

Please can some one give me regular expression for password with the following rules.

密码应至少为7个字符长。
它应该包含至少3个数字和一个英文字母。
密码可以接受的数字，字母，特殊字符除了数字任何次数应为最少3

Password should be at least 7 characters long. It should contain minimum 3 digits and one alphabetic character. Password can accept numbers, alphabets, special characters any number of times except numbers should be minimum 3.

推荐答案

正常前pressions不确保字符的特定组特别好的出现一定的次数。虽然它可能是可能的 - 它无疑会被进行卷积的和非显而易见

Regular expressions aren't particularly good at ensuring that particular groups of characters appear a certain number of times. While it's probably possible - it would no doubt be convoluted and non-obvious.

如果您是在.NET（C＃或VB），可以使用一个简单的验证功能类似编程：

If you're programming in .NET (C# or VB) you can use a simple validation function something like:

bool ValidatePasswordCompliance( string password )
{
    int countDigits = 0;
    int countAlpha  = 0;
    int countOthers = 0;
    foreach( char c in password )
    {
         countDigit += c.IsDigit ? 1 : 0;
         countAlpha += c.IsAlpha ? 1 : 0;
         countOther += !(c.IsAlpha || c.IsDigit) ? 1 : 0;
    }
    return countDigits >= 3 && (countDigits + countAlpha + countOthers) >= 7;
}

如果你正在使用.NET 3.5或更高的工作，你可以使用LINQ来简化：

If you're working with .NET 3.5 or higher, you could use LINQ to simplify this:

bool ValidatePasswordCompliance( string password )
{
    return password.Count() >= 7 &&
           password.Count( x => x.IsDigit ) >= 3;
}

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