.NET Regular Expression to Create STRONG Password

Question

Here is the .NET regular expression that I use to create a strong password (which is not true for my project password requirements):

(?=^.{15,25}$)(\d{2,}[a-z]{2,}[A-Z]{2,}[!@#$%&+~?]{2,})

Password Requirements:

• Minimum 15 characters (up to 25)
• Two numbers
• Two uppercase letters
• Two lowercase letters
• Two special characters ! @ # $ % & + ~ ?

They don’t have to be next to each other and in a certain order, since the regular expression that I inserted is required.

The above regex requires a password similar to this: 12abCD! @QWertyP

He REQUIRES them in a specific order in RE ... this is not what I want!

This must pass a properly formatted RE with the above specifications: Qq1W! w2Ee # 3Rr4 @ Tt5

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Answer 1

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#/VB :

bool IsStrongPassword( String password )
{
    int upperCount = 0;
    int lowerCount = 0;
    int digitCount = 0;
    int symbolCount = 0;

    for ( int i = 0; i < password.Length; i++ )
    {
        if ( Char.IsUpper( password[ i ] ) )
            upperCount++;
        else if ( Char.IsLetter( password[ i ] ) )
            lowerCount++;
        else if ( Char.IsDigit( password[ i ] ) )
            digitCount++;
        else if ( Char.IsSymbol( password[ i ] ) )
            symbolCount++;
    }

    return password.Length >= 15 && upperCount >= 2 && lowerCount >= 2 && digitCount >= 2 && symbolCount >= 2;
}

Answer 2

:

:

int count_alpha = 0, count_digit = 0, count_symbol = 0, ...

for each ch in password:
  if is_alpha(ch):
     count_alpha += 1
  elif is_digit(ch):
     count_digit += 1
  ...

if (count_alpha < 2) or (count_digit < 2) or ...
  rejection_message() 
  ...

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Answer 3

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4 :

• \d{2,}
• [a-z]{2,}
• [a-z]{2,}
• [!@#$%&+~?]{2,}

:

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Answer 4

^(?=.*\d.*\d)(?=.*[a-z].*[a-z])(?=.*[A-Z].*[A-Z])(?=.*[!@#$%&+~?].*[!@#$%&+~?]).{15,25}$

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Answer 5

, :

(?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[!@#$%&+~?])^.{15,25}$

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Answer 6

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^ (? = (.\) {2}) (? = (. [AZ]) {2}) (? = (. [AZ]) {2}) (? = (. [@# $% &!? + ~].) {2})) {15,25} $

Answer 7

^((?=(.*\d){2,})(?=(.*[a-z]){2,})(?=(.*[A-Z]){2,})(?=(.*[!@#$%&+~?]){2,})).{15,25}$

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