Hi,
Yes you are right mundhir123
Regexopattern: ^([0-9]){2}(A)([0-9]){2}
^ = starts with
([0-9]) = () a group, this is first group, [] range, so full first group is a group with range 0-9
{2} = number of times this should occur, {2} says the group above should occur 2 times
(A) = new group...