Apache Geode CHANGELOG

Region Naming

To be able to perform all available operations on your data regions, follow these region naming guidelines.

Characters permitted in region names are alphanumeric characters (ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789), period (.), underscore (_), square brackets ([, ]), hyphen (-), caret (^) and backquote (“`).
Do not use the slash character (/).
Do not begin region names with two underscore characters (__), as this is reserved for internal use.