Esto seria que quiere extraer la parte numerica del String, ahi si se entiende un poco, a ver:
Código:
Function TheFunction()
Dim I As Integer
Dim NumericPart As String
For I = 1 To Len("ABC1234")
If Not IsNumeric(Right("ABC1234",I)) Then
NumericPart = Right("ABC1234", I-1)
Exit For
End If
Next I
TheFunction = Len(Text1) - Len(NumericPart)
End Function