Hello. I use the regular expression in google forms to validate the answer: It has 7 strings all caps 3 letters from A to Z 1 number from 0 to 9 1 letter from A to J 3 numbers from 0 to 9^([A-Z]{3})([0-9][A-J0-9][0-9][0-9])$It has 7 strings all caps ...