You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main_air.go
    path of file: ./repos/ServerScan/ServerScan Air
    
    the code of the file until where you have to start completion: package main

import (
	"./package/icmpcheck"
	"./package/portscan"
	"fmt"
	"github.com/malfunkt/iprange"
	"os"
	"regexp"
)

func main(){
	var argv []string

	if (len(os.Args) != 4) {
		fmt.Println("ServerScan for Port Scaner.\nVersion: v1.0.2\nBy: Trim\n" +
			"HOST  Host to be scanned, supports four formats:\n\t\t192.168.1.1\n\t\t192.168.1.1-10\n\t\t192.168.1.*\n\t\t192.168.1.0/24\n"+
			"PORT  Customize port list, separate with ',' example: 21,22,80-99,8000-8080 ...\n"+
			"MODEL Scan Model: icmp or tcp")
		os.Exit(0)
	}

	for _, s := range os.Args {
		argv = append(argv,s)
	}

	hosts := argv[1]

	hostsPattern := `^(([01]?\d?\d|2[0-4]\d|25[0-5])\.){3}([01]?\d?\d|2[0-4]\d|25[0-5])\/(\d{1}|[0-2]{1}\d{1}|3[0-2])$|^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9]{1,2})){3}$`
	hostsRegexp := regexp.MustCompile(hostsPattern)
	checkHost := hostsRegexp.MatchString(hosts)

	hostsPattern2 := `\b(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})\-((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2}))\b`
	hostsRegexp2 := regexp.MustCompile(hostsPattern2)
	
    
func main(){
	var argv []string

	if (len(os.Args) != 4) {
		fmt.Println("ServerScan for Port Scaner.\nVersion: v1.0.2\nBy: Trim\n" +
			"HOST  Host to be scanned, supports four formats:\n\t\t192.168.1.1\n\t\t192.168.1.1-10\n\t\t192.168.1.*\n\t\t192.168.1.0/24\n"+
			"PORT  Customize port list, separate with ',' example: 21,22,80-99,8000-8080 ...\n"+
			"MODEL Scan Model: icmp or tcp")
		os.Exit(0)
	}

	for _, s := range os.Args {
		argv = append(argv,s)
	}

	hosts := argv[1]

	hostsPattern := `^(([01]?\d?\d|2[0-4]\d|25[0-5])\.){3}([01]?\d?\d|2[0-4]\d|25[0-5])\/(\d{1}|[0-2]{1}\d{1}|3[0-2])$|^(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9]{1,2})(\.(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[0-9]{1,2})){3}$`
	hostsRegexp := regexp.MustCompile(hostsPattern)
	checkHost := hostsRegexp.MatchString(hosts)

	hostsPattern2 := `\b(?:(?:25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2})\-((2(5[0-5]|[0-4]\d))|[0-1]?\d{1,2}))\b`
	hostsRegexp2 := regexp.MustCompile(hostsPattern2)
	checkHost2 := hostsRegexp2.MatchString(hosts)

	hostsPattern3 := `((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(\*$)`
	hostsRegexp3 := regexp.MustCompile(hostsPattern3)
	checkHost3 := hostsRegexp3.MatchString(hosts)

	if hosts == "" || (checkHost == false && checkHost2 == false && checkHost3 == false){
		fmt.Println("HOST  Host to be scanned, supports four formats:\n\t\t192.168.1.1\n\t\t192.168.1.1-10\n\t\t192.168.1.*\n\t\t192.168.1.0/24\n")
		os.Exit(0)
	}

	var hostLists []string
	hostlist, err := iprange.ParseList(hosts)
	if err == nil {
		hostsList := hostlist.Expand()
		for _, host := range hostsList {
			host :=host.String()
			hostLists = append(hostLists, host)
		}
	}else {
		fmt.Println("HOST  Host to be scanned, supports four formats:\n\t\t192.168.1.1\n\t\t192.168.1.1-10\n\t\t192.168.1.*\n\t\t192.168.1.0/24\n")
		os.Exit(0)
	}


	ports := argv[2]
	portsPattern := `^([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])$|^\d+(-\d+)?(,\d+(-\d+)?)*$`
	portsRegexp := regexp.MustCompile(portsPattern)
	checkPort := portsRegexp.MatchString(ports)
	if ports != "" && checkPort == false{
		fmt.Println("PORT Error.  Customize port list, separate with ',' example: 21,22,80-99,8000-8080 ...\n")
		os.Exit(0)
	}

	model := argv[3]

	if model == "icmp"{
		AliveHosts := icmpcheck.ICMPRun(hostLists)
		for _,host :=range AliveHosts{
			fmt.Printf("(ICMP) Target '%s' is alive\n",host)
		}
		portscan.TCPportScan(AliveHosts,ports,model)
	}else if (model == "tcp"){
		aliveHosts,AliveAddress := portscan.TCPportScan(hostLists,ports,model)
		for _,host :=range aliveHosts{
			fmt.Printf("(TCP) Target '%s' is alive\n",host)
		}
		for _,addr :=range AliveAddress{
			fmt.Println(addr)
		}
	}else {
		fmt.Println("MODEL Error. Scan Model: icmp or tcp")
		os.Exit(0)
	}
}