//	isIP('::1') // returns true
//	isIP('127.0.0.256') // returns false
//	isIP(':::1') // returns false
//
// ip.isCanonical
//
// Returns true if the IP address is in its canonical form.
// There is exactly one canonical form for every IP address, so fields containing
// IPs in canonical form can just be treated as strings when checking for equality or uniqueness.
//
//	ip.isCanonical(<string>) <bool>
//
// Examples:
//

		// returns "com" as the jar key is generated from host.
	}
	prevDot := strings.LastIndex(host[:i-1], ".")
	return host[prevDot+1:]
}

// isIP reports whether host is an IP address.
func isIP(host string) bool {
	if strings.ContainsAny(host, ":%") {
		// Probable IPv6 address.
		// Hostnames can't contain : or %, so this is definitely not a valid host.

			for _, msg := range validation.IsDNS1123Subdomain(ingress.Hostname) {
				allErrs = append(allErrs, field.Invalid(idxPath.Child("hostname"), ingress.Hostname, msg))
			}
			if isIP := (netutils.ParseIPSloppy(ingress.Hostname) != nil); isIP {
				allErrs = append(allErrs, field.Invalid(idxPath.Child("hostname"), ingress.Hostname, "must be a DNS name, not an IP address"))
			}
		}
	}
	return allErrs
}

			// in length.
			regexCost := uint64(math.Ceil(float64(actualSize(args[1])) * common.RegexStringLengthCostFactor))
			cost := strCost * regexCost
			return &cost
		}
	case "cidr", "isIP", "isCIDR":
		// IP and CIDR parsing is a string traversal.
		if len(args) >= 1 {
			cost := uint64(math.Ceil(float64(actualSize(args[0])) * common.StringTraversalCostFactor))
			return &cost
		}
	case "ip":

	"1.1.1.300":            false,
	"www.foo.bar.net":      false,
	"123.foo.bar.net":      false,
}

func TestIsIP(t *testing.T) {
	for host, want := range isIPTests {
		if got := isIP(host); got != want {
			t.Errorf("%q: got %t, want %t", host, got, want)
		}
	}
}

var defaultPathTests = map[string]string{
	"/":           "/",
	"/abc":        "/",
	"/abc/":       "/abc",