I have two columns in which I would like to limit the way text is input:

1) Lastname,First initial with no spaces (i.e., Smith,R)
2) One capital letter followed by five digits (i.e., D12345)

I do not have any ideas for column 1.

I can use the Limited Text validation feature for column 2, but that only
limits the number of characters, not the type of characters input.

Thank you so much.