Converting String to Double in Excel / Macro - vba

Question

I try create new function in Excel, witch will counting given values (something like SUM function, but only with given prefix).
A
---------
1|AA30
2|AA10
3|BC446
4|AA10
// result will be 50 on SUM_PREFIX(A1:A4;"AA")
Problem is, when the value is in the form e.g AA10,434 or AA4.43. Could me anyone help me with my problem? This is my first stript in VB.
Function SUM_PREFIX(Data As Range, prefix As String) As Double
Dim result As Double
Dim strVal As String
Dim i As Integer
Dim objRegExp As Object
Set objRegExp = CreateObject("vbscript.regexp")
With objRegExp
.IgnoreCase = True
.MultiLine = False
.Pattern = "^[" + prefix + "]+[0-9]+(\,|\.)?[0-9]?$"
.Global = True
End With
For i = 1 To Data.Rows.Count
Debug.Print Data.Cells(i, 1)
If objRegExp.Test(Data.Cells(i, 1)) = True Then
strVal = Replace(Data.Cells(i, 1), prefix, "")
Debug.Print strVal
strVal = Trim(Replace(strVal, ",", "."))
Debug.Print strVal
result = result + CDbl(strVal)
End If
Next i
SUM_PREFIX = result
End Function
Thanks for help.

Answer 1

CDbl is locale-aware, so check if your Replace is correct (for example, in my locale, I have to replace "." by "," in order for it to work).
If you don't want to rely on locale-aware code, use Val instead of CDbl because Val only recognizes "." as a valid decimal separator regardless of locale.

Answer 2

Function SUM_PREFIXO(DADOS As Range, PREFIXO As String) As Double
Dim result, NI As Double
Dim strVal As String
Dim i As Integer
Dim objRegExp As Object
Set objRegExp = CreateObject("vbscript.regexp")
With objRegExp
.IgnoreCase = True
.MultiLine = False
.Pattern = "^[" + PREFIXO + "]+[0-9]+(\,|\.)?[0-9]?$"
.Global = True
End With
NI = DADOS.Rows.Count
For i = 1 To DADOS.Rows.Count
Debug.Print (DADOS.Cells(i, 1))
If objRegExp.Test(RetiraEspaço(DADOS.Cells(i, 1))) = True Then
strVal = Trim(Replace(DADOS.Cells(i, 1), PREFIXO, ""))
Debug.Print strVal
strVal = Trim(Replace(strVal, ".", ","))
Debug.Print strVal
strVal = Trim(Replace(strVal, ",", ","))
Debug.Print strVal
result = result + CDbl(strVal)
End If
Next i
SUM_PREFIXO = result
End Function
'Com o código abaixo pode-se
'remover os espaços extras entre as palavras de um texto:
Function RetiraEspaço(Texto)
Dim Vpalavra, inicio, termino, Wresultado
inicio = 1
Texto = UCase(Texto) & " "
Do Until InStr(inicio, Texto, " ") = 0
termino = InStr(inicio, Texto, " ")
Vpalavra = Mid(Texto, inicio, termino - inicio)
inicio = termino + 1
Wresultado = Wresultado & "" & Vpalavra
Loop
RetiraEspaço = Trim(Wresultado)
End Function