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Regular Expressions are a broad topic and cannot be covered in full here. This guide will demonstrate the use of HiveMQ’s pattern matching capabilities by creating a Trace Recording, matching all clients with a clientId beginning with publisher0, followed by a single character. Further the special case of creating a recording for topic tree patterns with use of the + character will be shown.
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The key to utilising RegEx in Trace Recording filters is knowing that client identifiers and topics are treated as regular strings by the filters, with no MQTT specific tokens |
Prerequisites
In order to verify, that our messages are being delivered as we expect we will subscribe to a test topic pattern.
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