常用正则

ip

ip的范围在0.0.0.0~255.255.255.255
((\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])(\.(\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])){3})

public void static main(String[] args){
    List<String> err = new ArrayList<>();
    String regex="((\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])(\\.(\\d|[1-9]\\d|1\\d{2}|2[0-4]\\d|25[0-5])){3})";
    for (int i=1;i<=255;i++){
        for (int j=1;j<=255;j++){
            for (int k=1;k<=255;k++){
                for (int l=1;l<=255;l++){
                    String ip=i+"."+j+"."+k+"."+l;
                    if(!ip.matches(regex)){
                        System.out.println(ip);
                        err.add(ip);
                    }
                }
            }
        }
    }
    System.out.println("不符合要求的为："+err);
}

端口

端口的范围限定在0-65535
([0-9]|[1-9]\d|[1-9]\d{2}|[1-9]\d{3}|[1-5]\d{4}|6[0-4]\d{3}|65[0-4]\d{2}|655[0-2]\d|6553[0-5])

//验证,输出的为不符合要求的端口
public void static main(String[] args){
	List<String> err=new ArrayList<>();
    String regex="([0-9]|[1-9]\\d|[1-9]\\d{2}|[1-9]\\d{3}|[1-5]\\d{4}|6[0-4]\\d{3}|65[0-4]\\d{2}|655[0-2]\\d|6553[0-5])";
    for(int i=0;i<=65536;i++){
        String port = String.valueOf(i);
        boolean matches = port.matches(regex);
        if(!matches){
            err.add(port);
        }
    }
    System.out.println(err);
}