how to allow multiple entries in a cell with a formula in custom data validation?

AwesomeSteph

Board Regular
Joined
Aug 18, 2017
Messages
80
I have a column in an excel sheet that users input data I want to make it so they can't miss something important. Using data validation custom formula works great to ensure the user only inputs ##-##-##[A-Z]###
however I want to be able to allow them to add multiple entries into a cell with only that criteria. Is it possible in data validation to do this?
 

Excel Facts

Can a formula spear through sheets?
Use =SUM(January:December!E7) to sum E7 on all of the sheets from January through December

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