[zeromq-dev] [Tech support] SUB socket filter with reverse logic

[Dev Aggarwal]

I know we can filter out the messages containing a keyword at the start of
message, using -

`zmq.setsocketopt(zmq.SUBSCRIBE, <keyword>)`

But how do I use this in reverse logic i.e., how do I **exclude** all
messages containing that keyword?

Related GitHub issue
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