https://www.w3schools.com/python/python_regex.asp
Guide
.⇒ any except newline\d⇒ any digit [0, 9]\D⇒ any character that is NOT a digit\s⇒ any whitespace character\S⇒ any non-whitespace character\w⇒ any word character, alphanumeric (a-z, A-Z and 0-9) and underscores (_ )\W⇒ any non-word characterX{n}⇒ n numbers of X, where X is any regex and n is the number of it