"regualr stuff" : https://www.geeksforgeeks.org/regular-expressions-regular-grammar-and-regular-languages/ https://www.geeksforgeeks.org/regular-expressions-reg

"regualr stuff" : https://www.geeksforgeeks.org/regular-expressions-regular-grammar-and-regular-languages/ https://www.geeksforgeeks.org/regular-expressions-regular-gr...