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This expression works based on the fact that you need the Right side of the string after the last period character. While we don't have a string function for the last character, we do have functions to reverse the characters of a string and then to find the first character.
@ChrisB Regex the most intimidating thing that should not be intimidating at all. @Thableaus sent over a great website for explaining what it is. If you want to do some real time testing, check out https://regex101.com/. Here you can paste your sample data in and play around with code and see how it reacts immediately.