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You can use wildcard characters when using Shared Dictionary paths:

The * wildcard matches zero or more characters traversing sub-trees.
For example, /countries/*/capital would match /countries/Canada/capital and /countries/USA/capital.

The ? wildcard is similar, but scans only one level in the hierarchy.
For example, /countries/?/population would match /countries/Canada/population but not /countries/USA/California/population.

The + wildcard matches a sub-tree and its root.
For example, /countries/Canada+ matches /countries/Canada and any keys under it, like /countries/Canada/anthem, /countries/Canada/Alberta/capital.

The & wildcard matches a GUID (Globally Unique Identifier) string.
For example, /countries/& matches /countries/{1a743fe3-5a5f-ed43-c32b-345ea8fb3c5a}.

The ^ wildcard matches a string of consecutive numbers.
For example, /countries/Canada^ matches /countries/Canada1 and /countries/Canada123, but not /countries/Canadas.

Exercise 1

Cover the righthand column and see if you can guess which keys match which subscription patterns.

No Wildcard

* Wildcard

? Wildcard

+ Wildcard

& Wildcard

^ Wildcard