Create a replace function in vb.net

Question

Please Help me in creating a replace function. Problem: Their is a alphanumeric value of any length (string) and I want to replace its all characters with 'X' except right four characters

Like : Value : 4111111111111111 Result Should be: XXXXXXXXXXXX1111

I have created a function but got stuck:

public function myfunction(str as string)
  str.Replace(str.Substring(0, str.Length - 5), 'X') 'but here I want no of x to be equals to count of length of str - 4
end function

What's a better function to perform such an operation?

Adam Maras · Accepted Answer · 2010-04-01 10:19:11Z

2

Try this on for size.

Public Shared Function ObfuscateCardNumber(ByVal cardNumber As String) As String
    If cardNumber.Length <= 4 Then
        Return cardNumber
    Else
        Return cardNumber _
            .Substring(cardNumber.Length - 4, 4) _
            .PadLeft(cardNumber.Length, "X"c)
    End If
End Function

edited Apr 1, 2010 at 10:19

answered Apr 1, 2010 at 10:04

Adam Maras

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1 Comment

Adam Maras Over a year ago

I fixed the character literal syntax on line 7, I do apologize for that.

AMissico · Accepted Answer · 2010-04-01 10:03:26Z

1

Dim sNumber As String = "4111111111111111"
Dim sResult As String = StrDup(sNumber.Length - 4, "X"c) + Strings.Right(sNumber, 4)

answered Apr 1, 2010 at 10:03

AMissico

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Comments

Ivo · Accepted Answer · 2010-04-01 10:05:20Z

0

something like

string result for(int i = 0;i > str.length -4;i++) { result = result +x } result = result + str.substrin(get last 4)

answered Apr 1, 2010 at 10:05

Ivo

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