Порядковый номер vba excel

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Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
    Dim sTruncated As String, sBase As String
    Dim sShortFileName As String, sExtension As String
    Dim s As String
    Dim i As Long
    sShortFileName = ActiveWorkbook.Name
    i = InStrRev(sShortFileName, ".", , vbTextCompare)
    sExtension = Right(sShortFileName, Len(sShortFileName) - i)
    sTruncated = Left(sShortFileName, i - 1)
    i = InStrRev(sTruncated, "_", , vbTextCompare)
    If i Then
        sBase = Left(sTruncated, i - 1)
        i = FindLast(sBase, sExtension)
        If i Then
            sShortFileName = sBase & "_" & CStr(i + 1) & "." & sExtension
        Else
            GoTo AddNum
        End If
    Else
AddNum:
        sShortFileName = sTruncated & "_1." & sExtension
    End If
    With ActiveWorkbook
        s = MyPath(.FullName) & sShortFileName
        .SaveCopyAs s
    End With
End Sub
Private Function FindLast(sBase As String, sExtension As String) As Long
    Dim sFileName As String, s As String
    Dim i As Long, imax As Long, iLen As Long
    iLen = Len(sBase)
    sFileName = MyPath(ActiveWorkbook.FullName) & "*." & sExtension
    s = Dir(sFileName)
    Do Until s = ""
        i = InStr(1, s, sBase, vbTextCompare)
        If i = 1 Then
            s = Right(s, Len(s) - iLen)
            i = FindNumber(s)
            imax = IIf(imax < i, i, imax)
        End If
        s = Dir
    Loop
    FindLast = imax
End Function
Private Function MyPath(sFullName As String) As String
    Dim i As Long
    i = InStrRev(sFullName, "", , vbTextCompare)
    MyPath = Left(sFullName, i)
End Function
Private Function FindNumber(sSearched As String) As Long
    Dim i As Long
    Dim s As String
    i = InStrRev(sSearched, ".", , vbTextCompare)
    s = Left(sSearched, i - 1)
    i = InStrRev(s, "_", , vbTextCompare)
    If i Then
        s = Right(s, Len(s) - i)
        FindNumber = Val(s)
    End If
End Function

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Private Sub Workbook_BeforeSave(ByVal SaveAsUI As Boolean, Cancel As Boolean)
    Dim sTruncated As String, sBase As String
    Dim sShortFileName As String, sExtension As String
    Dim s As String
    Dim i As Long, iNum As Long
    sShortFileName = ActiveWorkbook.Name
    i = InStrRev(sShortFileName, ".", , vbTextCompare)
    sExtension = Right(sShortFileName, Len(sShortFileName) - i)
    sTruncated = Left(sShortFileName, i - 1)
    i = InStrRev(sTruncated, "_", , vbTextCompare)
    sBase = sTruncated
    If i Then
        sBase = Left(sTruncated, i - 1)
        s = Right(sTruncated, Len(sTruncated) - i)
        i = Val(s)
        If i Then
            sTruncated = sBase
        Else
            sBase = sTruncated
        End If
    End If
    iNum = FindLast(sBase, sExtension)
    sShortFileName = sTruncated & "_" & CStr(iNum + 1) & "." & sExtension
    With ActiveWorkbook
        s = MyPath(.FullName) & sShortFileName
        .SaveCopyAs s
     End With
End Sub
 
Private Function FindLast(sBase As String, sExtension As String) As Long
    Dim sFileName As String, s As String
    Dim i As Long, imax As Long, iLen As Long
    iLen = Len(sBase)
    sFileName = MyPath(ActiveWorkbook.FullName) & "*." & sExtension
    s = Dir(sFileName)
    Do Until s = ""
        i = InStr(1, s, sBase, vbTextCompare)
        If i = 1 Then
            s = Right(s, Len(s) - iLen - 1)
            i = Val(s)
            imax = IIf(imax < i, i, imax)
        End If
        s = Dir
    Loop
    FindLast = imax
End Function
Private Function MyPath(sFullName As String) As String
    Dim i As Long
    i = InStrRev(sFullName, "", , vbTextCompare)
    MyPath = Left(sFullName, i)
End Function