e for memory medium.
The maximum usage on memory medium EmptyDir would be the minimum value between
the SizeLimit specified here and the sum of memory limits of all containers in a pod.
The default is nil which means that the limit is undefined.
More info: https://kubernetes.io/docs/concepts/storage/volumes#emptydirjq^(\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))(([KMGTPE]i)|[numkMGTPE]|([eE](\+|-)?(([0-9]+(\.[0-9]*)?)|(\.[0-9]+))))?$ú