access中，用replace函数做替换，如何区分中文分号和英文分号

Function CheckStr(byVal ChkStr) ＇检查无效字符
 Dim Str:Str=ChkStr
 Str=Trim(Str)
 If IsNull(Str) Then
  CheckStr = ""
  Exit Function 
 End If
 Dim re
 Set re=new RegExp
 re.IgnoreCase =True
 re.Global=True
 re.Pattern="(\r\n){3,}"
 Str=re.Replace(Str,"$1$1$1")
 Set re=Nothing
 Str = Replace(Str,"＇","＇＇")
 Str = Replace(Str, "Ｓelect", "Ｓelect")
 Str = Replace(Str, "join", "join")
 Str = Replace(Str, "union", "union")
 Str = Replace(Str, "where", "where")
 Str = Replace(Str, "insert", "insert")
 Str = Replace(Str, "delete", "delete")
 Str = Replace(Str, "update", "update")
 Str = Replace(Str, "like", "like")
 Str = Replace(Str, "drop", "drop")
 Str = Replace(Str, "create", "create")
 Str = Replace(Str, "modify", "modify")
 Str = Replace(Str, "rename", "rename")
 Str = Replace(Str, "alter", "alter")
 Str = Replace(Str, "cast", "cast")
 CheckStr=Str
End Function
keyword=CheckStr(request("keyword"))