数据-有效性-自定义来源:=LEN(A1)=SUMPRODUCT((CODE(MID(A1,ROW(INDIRECT("1:"&LEN(A1))),1))>=48)*(CODE(MID(A1,ROW(INDIRECT("1:"&LEN(A1))),1))<=57)+(CODE(MID(A1,ROW(INDIRECT("1:"&LEN(A1))),1))>=65)*(CODE(MID(A1,ROW(INDIRECT("1:"&LEN(A1))),1))<=90))
可以用有效性设定