Exercise from code_wars

Domain_Name

import re


def domain_name(url):
    """Write a function that when given a URL as a string, parses out just the domain name and returns it as a
    string. """
    #  Creating a Regular expression to search a website
    regex = re.compile(r"""(http://www.|https://www.|www.|http://|https://)?(.*)\.""")
    #  Writing down matches into result variable and splitting them into groups
    result = regex.match(url).group(2).split(".")
    #  If result contains more than 1 group - remove other groups, else create a string with the name in result
    return ''.join([result[0] if len(result) > 1 else ''.join(result)])


print(domain_name("http://github.com/carbonfive/raygun"))  # "github"
print(domain_name("http://www.zombie-bites.com"))  # "zombie-bites"
print(domain_name("https://www.cnet.com"))  # "cnet"
print(domain_name("http://google.co.jp"))  # "google"