Text Column Validation: Numbers only, 5 numbers, a period, and 3 numbers

Question

In my SharePoint list, I need a text column [ID] to validate as 5 numbers, a period, and then 3 numbers. Example: "15202.123" and I need help. :-)

Thank you!

Answer 1

Try this:

=IF(LEN([YourColumn])=9,IF(MID([YourColumn],6,1)=".",IF(ISNUMBER(VALUE((MID([YourColumn],1,5)))),ISNUMBER(VALUE((MID([YourColumn],7,3)))),FALSE),FALSE),FALSE)

First it validates if it's a 9 character string or not, then checks if the 6th character is a dot (.), then it validates the first 5 and last 3 characters.

Of course, it might be possible to write in an easier way.

Let me know if this helps.