human
Solve the following python programming problem given the following code:
def _make_ping(command) : 
    def f(self, irc, msg, args, optlist, host) : 
        '[--c <count>] [--i <interval>] [--t <ttl>] [--W <timeout>] [--4|--6] <host or ip>

            Sends an ICMP echo request to the specified host.
            The arguments correspond with those listed in ping(8). --c is
            limited to 10 packets or less (default is 5). --i is limited to 5
            or less. --W is limited to 10 or less.
            --4 and --6 can be used if and only if the system has a unified
            ping command.
            ' 
        pingCmd = self.registryValue (registry.join ([command, 'command'])) 
        if (not pingCmd) : 
            irc.error (('The ping command is not configured.  If one is installed, reconfigure supybot.plugins.Unix.%s.command appropriately.' % command), Raise = True) 
else : 
            try : 
                host = host.group (0) 
except AttributeError : 
                pass 
args = [pingCmd] 
            for (opt, val) in optlist : 
                if ((opt == 'c') and (val > 10)) : 
                    val = 10 
if ((opt == 'i') and (val > 5)) : 
                    val = 5 
if ((opt == 'W') and (val > 10)) : 
                    val = 10 
args.append (('-%s' % opt)) 
                if (opt not in ('4', '6')) : 
                    args.append (str (val)) 
if ('-c' not in args) : 
                args.append ('-c') 
                args.append ('5') 
args.append (host) 
            try : 
                with open (os.devnull) as null : 
                    inst = subprocess.Popen (args, stdout = subprocess.PIPE, stderr = subprocess.PIPE, stdin = null) 
except OSError as e : 
                irc.error (('It seems the configured ping command was not available (%s).' % e), Raise = True) 
result = inst.communicate () 
            if result [1] : 
                irc.error (' '.join (result [1].decode ('utf8').split ())) 
else : 
                response = result [0].decode ('utf8').split ('
') 
                if response [1] : 
                    irc.reply...

    
    

    Fix the buggy line: }), first ('ip', ('matches', command, 'Invalid hostname'))]))
assistant
#Here is Python code to fix the buggy line: }), first ('ip', ('matches', command, 'Invalid hostname'))]))
.

}), first ('ip', ('matches', _hostExpr, 'Invalid hostname'))]))