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. :-)
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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.