Help manipulating my String

Try this mod to the original. Note:  because of your need to have a variable step between the letters, I had to introduce a "global" variable. This is replacementStep. You would need to set this variable prior to any call to Regex.Replace--at least any that use the ReplacementDelegate. I'd rather not have a global, but since the delegate definition for the third parameter to Regex.Replace dictates that the receiving method have one parameter, and that parameter be of type Match, I don't see another way to overcome this. If the step is later determined to be a fixed value, then you can remove the global and enter the fixed value for each occurrence of replacementStep within the ReplacementDelegate method.

Module Module1
    Private replacementStep As Integer

    Sub Main()
        replacementStep = 5

        Dim input As String = "=SUM(AA1+AZZ1+D1)"
        Dim result As String = System.Text.RegularExpressions.Regex.Replace(input, "([A-Z]+)(\d+)", AddressOf ReplacementDelegate)

        Console.WriteLine(input)
        Console.WriteLine(result)
        Console.ReadKey()
    End Sub

    Function ReplacementDelegate(ByVal m As System.Text.RegularExpressions.Match) As String
        Dim convertedLetters() As Char = m.Groups(1).Value.ToCharArray()
        Dim convertedNumber As Integer = Convert.ToInt32(m.Groups(2).Value)

        For i As Integer = convertedLetters.Length - 1 To 0 Step -1
            If i = convertedLetters.Length - 1 Then
                convertedLetters(i) = Chr(Asc(convertedLetters(i)) + replacementStep)
            End If

            If convertedLetters(i) > "Z"c Then
                convertedLetters(i) = "A"c
                convertedLetters(i - 1) = Chr(Asc(convertedLetters(i - 1)) + replacementStep)
            Else
                Exit For
            End If
        Next

        convertedNumber += 1

        Return (New String(convertedLetters) + convertedNumber.ToString())
    End Function

End Module

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Nice, almost done but I think there is a bug If I do:


 "=SUM(X1+Y1+Z1)"

can you try?

I concur. I'm looking into it.

I dont know if its the Z or my replacementValue that is 24   and the Char value on line :

convertedLetters(i) = Chr(Asc(convertedLetters(i)) + replacementStep)

gives me " [ "

Thank you Kaufmed.!!

Kaufmed, I just had an error with this code replacementStep is 26
Im receiving  "]"c  on line

convertedLetters(convertedLetters.Length - 1) = Chr(Asc(convertedLetters(convertedLetters.Length - 1)) + replacementStep)


mmm... want me to create a question ?

replacement was 52 sorry not 26

input was = C3-C4

here's the new question:

https://www.experts-exchange.com/questions/27732485/Help-manipulating-a-String.html