perl 检验ip地址是否合法

根据合法ip规格，写了个检验程序：

合法ip:(1..255).(0..255).(0..255).(0..255)范畴

sub report{
??? print $_[0];
??? exit($_[1]);
}
sub check_ip{
if ($_[0] =~ /^(d{1,3}).(d{1,3})$/){
??? if($1>0&&$1<256){
??????? if($2>-1&&$2<256){
??????????? if($3>-1&&$3<256){
??????????????? if($4>-1&&$4<256){
??????????????????? &report(qq($_[0] address True!n),0);
??????????????? }
??????????????? else{
??????????????????? &report(qq(ip[4] need ">-1 <256"n),1);
??????????????? }?
????????
????????????? }
????????????? else{
?????????????????? &report(qq(ip[3] need ">-1 <256"n),1);
????????????? }
????????
????????? }
????????? else{
????????????? &report(qq(ip[2] need ">-1 <256"n),1);;
????????? }
????? }
??? else{
??????? &report(qq(ip[1] need ">0 <256"n),1);
??? }
}
else{
?? &report(qq($_[0] address Error!n),1);
}
}
&check_ip($ARGV[0]);

?

有错误的地方，请指出。谢谢!