问题
I want to force users to enter data in a specific cell in a sequence like ABCDE1234F
i.e. first five characters must me letters then four digits and last must be a letter using custom data validation.
回答1:
It is quite long:
=AND(ISNUMBER(SUMPRODUCT(SEARCH("~"&MID(A1,ROW($1:$5),1),"abcdefghijklmnopqrstuvwxyz"))),ISNUMBER(SUMPRODUCT(SEARCH("~"&MID(A1,ROW($6:$9),1),"0123456789"))),ISNUMBER(SUMPRODUCT(SEARCH("~"&MID(A1,10,1),"abcdefghijklmnopqrstuvwxyz"))),LEN(A1)=10)
It goes through each of the required text characters and checks if it is a number or a string. Then it test the full range of numbers for text. It also ensures that it is ten characters long.
回答2:
You may try following formula
=AND(ISTEXT(LEFT(A1,5)),ISNUMBER(MID(A1,6,4)*1),ISTEXT(MID(A1,10,1)),IF(LEN(A1)=10,TRUE,FALSE))
来源：https://stackoverflow.com/questions/35243555/custom-data-validation-in-excel-for-alpha-numeric-alpha-value