Subscribing to topics using regex/wildcards seems to not work

[Gambradan]

When specifying a topic name to subscribe to (in TKafkaFactory.NewConsumer), regex wildcards do not work (^* or anything else).

rd_kafka_subscribe description says that

 * Wildcard (regex) topics are supported:
 * any topic name in the \p topics list that is prefixed with \c \"^\" will
 * be regex-matched to the full list of topics in the cluster and matching
 * topics will be added to the subscription list.

However, specifying any wildcards for it and calling it does not seem to work either.

Maybe there is some special regex string handling required?

[Gambradan]

Issue can be resolved by upgrading librdkafka DLL to a newer version.