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: appprotect_common.go
    path of file: ./repos/kubernetes-ingress/pkg/apis/configuration/validation
    
    the code of the file until where you have to start completion: package validation

import (
	"fmt"
	"net"
	"regexp"
	"strconv"
	"strings"

	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
)

// ValidateRequiredSlices validates the required slices.
func ValidateRequiredSlices(obj *unstructured.Unstructured, fieldsList [][]string) error {
	for _, fields := range fieldsList {
		field, found, err := unstructured.NestedSlice(obj.Object,
    
func ValidateAppProtectLogDestination(dstAntn string) error {
	errormsg := "error parsing App Protect Log config: Destination must follow format: syslog:server=<ip-address | localhost>:<port> or fqdn or stderr or absolute path to file"
	if !logDstEx.MatchString(dstAntn) {
		return fmt.Errorf("%s Log Destination did not follow format", errormsg)
	}
	if dstAntn == "stderr" {
		return nil
	}

	if logDstFileEx.MatchString(dstAntn) {
		return nil
	}

	dstchunks := strings.Split(dstAntn, ":")

	// This error can be ignored since the regex check ensures this string will be parsable
	port, _ := strconv.Atoi(dstchunks[2])

	if port > 65535 || port < 1 {
		return fmt.Errorf("error parsing port: %v not a valid port number", port)
	}

	ipstr := strings.Split(dstchunks[1], "=")[1]
	if ipstr == "localhost" {
		return nil
	}

	if logDstFQDNEx.MatchString(ipstr) {
		return nil
	}

	if net.ParseIP(ipstr) == nil {
		return fmt.Errorf("error parsing host: %v is not a valid ip address or host name", ipstr)
	}

	return nil
}