+If the string corresponding to 'key' is equal to 'oldvalue' then set key for 'value' and post given messages to the corresponding channels if key value was set successfully
+
+## SETNEPUB key value oldvalue channel message [channel message...]
+
+Time complexity: O(1) + O(1) + O(1) + O(N_1+M) [ + O(N_2+M) + ... ] where N_i are the number of clients subscribed to the receiving channel and M is the total number of subscribed patterns (by any client).
+
+If the string corresponding to 'key' is not equal to 'oldvalue' then set key for 'value' and post given messages to the corresponding channels if key value was set successfully