要在Excel中獲取區域內各單元格字符串中的相同字符，可用下面的自定義函數。例如要在D1單元格獲取A1:C1區域各單元格中相同的字符，如圖：

???

??? 按Alt+F11，打開VBA編輯器，單擊菜單“插入→模塊”，在代碼窗口中輸入自定義函數：

Function GetDupChars(rRng As Range) As String
??? Application.Volatile
??? Dim i As Integer, j As Integer, k As Integer
??? Dim Str As String
??? Str = rRng.Item(1).Text
??? For i = 1 To Len(Str)
????? k = 0
????? For j = 2 To rRng.Cells.Count
????? If InStr(rRng.Item(j).Text, Mid(Str, i, 1)) Then k = k + 1
????? Next
????? If k = j - 2 And InStr(GetDupChars, Mid(Str, i, 1)) = 0 _
????????? Then GetDupChars = GetDupChars & Mid(Str, i, 1)
??? Next
End Function

??? 然后關閉VBA編輯器，在D1單元格中輸入公式即可：

??? =GetDupChars(A1:C1)