}

// 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])
	}