}

// IsValidPathElement reports whether pe is a valid path element.
func IsValidPathElement(pe string) bool {
	return ValidKeyRegex.MatchString(pe)
}

// IsKVPathElement report whether pe is a key/value path element.
func IsKVPathElement(pe string) bool {
	pe, ok := RemoveBrackets(pe)
	if !ok {
		return false
	}

	kv := splitEscaped(pe, kvSeparatorRune)

	if len(path) == 0 {
		return nil, fmt.Errorf("empty path %s", path)
	}
	if util.IsKVPathElement(path[0]) {
		return nil, fmt.Errorf("path %s has an unexpected first element %s", path, path[0])
	}
	length := len(path)
	if util.IsKVPathElement(path[length-1]) {
		return nil, fmt.Errorf("path %s has an unexpected last element %s", path, path[length-1])
	}

			expect: false,
		},
		{
			desc:   "one-bracket",
			in:     "[1:2",
			expect: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.desc, func(t *testing.T) {
			if got := IsKVPathElement(tt.in); got != tt.expect {
				t.Errorf("%s: expect %v got %v", tt.desc, tt.expect, got)
			}
		})
	}
}

func TestIsVPathElement(t *testing.T) {
	tests := []struct {
		desc   string

		return nc, true, nil
	}
	pe := remainPath[0]

	if nc.Node == nil {
		if !createMissing {
			return nil, false, fmt.Errorf("node %s is zero", pe)
		}
		if util.IsNPathElement(pe) || util.IsKVPathElement(pe) {
			nc.Node = []any{}
		} else {
			nc.Node = make(map[string]any)
		}
	}

	v := reflect.ValueOf(nc.Node)
	if v.Kind() == reflect.Ptr || v.Kind() == reflect.Interface {
		v = v.Elem()
	}