Use Pattern also for shared subscription without wildcards #3199
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A regex Pattern is used for wildcard subscriptions to match topic's subscriptions (es: device/+/command) to topic's messages (es: device/SERIAL_1/command).
The Pattern usage is also need for shared subscritions, when a topic's subscriptions (es: $share/group/cloud/notification) have to match with a topic's messages (es: cloud/notification).