Check if a string contains a Version with more than 3 decimal points

I am trying to get a the sub releases of a program, and this returns the following string Release 4.2.3 of programX but also sometimes: Release 4.3 of programX. I want to do a check if the string contains 3 or more decimal places (like 4.3.2).
I found This question with answer but it's not for C#, is this possible in C# and if so what would be the best approach?