By default, the executor pod prefix is generated by the app name. It handles characters that match [^a-z0-9\\-] differently. The '.' and all whitespaces will be converted to '-', but other ones to empty string. Especially, characters like '_', '|' are commonly used as a word separator in many languages.
According to the K8S DNS Label Names, see https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-label-names, we can convert all special characters to `-`.