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Nickname between 3 and 15 characters; can contain a dot but cannot start or end with the dot; can end with digits
Password at least 8 characters; must contain at least one lowercase letter (a-z), one uppercase letter (A-Z), one numeric digit (0-9), and one special character [@$!%*#?&], but cannot contain whitespace.
: https://www.google.com/intl/en_en/chrome/