Redis PUNSUBSCRIBE command unsubscribes the client from the given patterns, or from all of them if none is given. When no patterns are specified, the client is unsubscribed from all the previously subscribed patterns. In this case, a message for every unsubscribed pattern will be sent to the client.
Following is the basic syntax of Redis PUNSUBSCRIBE command.
redis 127.0.0.1:6379> PUNSUBSCRIBE [pattern [pattern ...]]
redis 127.0.0.1:6379> PUNSUBSCRIBE mychannel 1) "punsubscribe" 2) "a" 3) (integer) 1