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Fun challenge
Nice exercise, but doing this in real life there would be the challenge of dealing with individuals with the same first initial and last name. I tested for it, but it didn't exist in this dataset.
Uppercase(REGEX_Replace([Users], '(\w)(\w+)\s*(\w*)\s([A-z]*)(\d+)', '$1'))
+REGEX_Replace([Users], '(\w)(\w+)\s*(\w*)\s([A-z]*)(\d+)', '$4@testemail.com')