""" Create a function validate_phone_number that uses regex to validate if phone number passed in is valid and returns True if so and False if not. Let us assume that phone number is in format (XXX) XXX-XXXX. """

""" Create a function validate_email that uses regex to validate if an email passed in is valid and returns True if so and False if not. Let us say in this case that the top-level domain (e.g. .com) is at most 4 letters. Furthermore, remember that case does not matter. You must also have at least 1 character before the @ character, and the domain must be at least 1 character. """

""" Create a function validate_ipv4 that uses regex to validate if an ipv4 address passed in as dot decimal notation is valid and returns True if so and False if not. Read https://en.wikipedia.org/wiki/IPv4 to see the format of the IPV4, ignore the subnet mask. """

""" Create a function get_grades which opens a file to a given filename and returns a list of all the grades. Grades in the list are of the format "grade: XXX%". You must match a single character percentage e.g. 9% up to a three chracter percentage e.g. 100%. """