How to use the investigate.investigate.Investigate.IP_PATTERN.match function in investigate

def latest_domains(self, ip):
        '''Gets the latest known malicious domains associated with the given
        IP address, if any. Returns the list of malicious domains.
        '''
        if not Investigate.IP_PATTERN.match(ip):
            raise Investigate.IP_ERR

        uri = self._uris["latest_domains"].format(ip)
        resp_json = self.get_parse(uri)

        # parse out the domain names
        return [ val for d in resp_json for key, val in iteritems(d) if key == 'name' ]

def as_for_ip(self, ip):
        '''Gets the AS information for a given IP address.'''
        if not Investigate.IP_PATTERN.match(ip):
            raise Investigate.IP_ERR

        uri = self._uris["as_for_ip"].format(ip)
        resp_json = self.get_parse(uri)

        return resp_json