Generate Random Password based on Regex Pattern

Question

Hi,

I have below Regex for my password:

internal const string PasswordRegex = @"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^\da-zA-Z]).{8,15}$";

How can i generate random passwords which match the above pattern?

Thanks,
Jassim

Answer 1

If not opposed to a non regular expression generator, see the following NuGet package, source code, test. The package has over 500.000 downloads and meets OWASP requirements.

Answer 2

Hello,
Welcome to our Microsoft Q&A platform!
You can get the random passwords like following code:

string chars = "0123456789ABCDEFGHIJKLMNOPQSTUVWXYZabcdefghijklmnpqrstuvwxyz";  
private string creat()  
{  
Random randomNnmber = new Random();  
int len = randomNnmber.Next(8, 15);//get the max(15) and min(8)  
string randomStr = "";  
  
for (int i = 0; i < len; i++)  
{  
randomStr += chars[randomNnmber.Next(chars.Length)];  
}  
if (!Regex.IsMatch(randomStr, PasswordRegex))// the PasswordRegex you provided  
{  
Console.WriteLine($"{randomStr}");  
return creat();  
}  
else  
{  
Console.WriteLine($"{randomStr}");  
return randomStr;  
}  
}  

Best Regards,

Wenyan Zhang

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