new_contents: #!/usr/local/bin/python
  # Code Fights Is IPv4 Address Problem
  
  
  def isIPv4Address(inputString):
      import re
      pattern = re.compile(r'^\d{1,3}(?:\.\d{1,3}){3}$')
      match = re.search(pattern, inputString)
      if match:
          segments = inputString.split(".")
          return sum([int(x) >= 0 and int(x) <= 255 for x in segments]) == 4
  
      return False
  
  
  def main():
      tests = [
          ["172.16.254.1", True],
          ["172.316.254.1", False],
          [".254.255.0", False],
          ["1.1.1.1a", False],
          ["1", False],
          ["0.254.255.0", True],
          ["1.23.256.255.", False],
          ["1.23.256..", False],
          ["0..1.0", False],
          ["1.1.1.1.1", False],
          ["1.256.1.1", False],
          ["a0.1.1.1", False],
          ["0.1.1.256", False],
          ["129380129831213981.255.255.255", False],
          ["255.255.255.255abcdekjhf", False],
          ["7283728", False]
      ]
  
      for t in tests:
          res = isIPv4Address(t[0])
          if t[1] == res:
              print("PASSED: isIPv4Address({}) returned {}"
                    .format(t[0], res))
          else:
              print("FAILED: isIPv4Address({}) returned {}, should have returned {}"
                    .format(t[0], res, t[1]))
  
  
  if __name__ == '__main__':
      main()
  
subject: Solve Code Fights is IPv4 address problem