Redis Pub/Sub: PSUBSCRIBE
Redis PSUBSCRIBE Command
Redis PSUBSCRIBE command is used to subscribe to channels matching the given patterns.
Here are some common uses and scenarios for the "PSUBSCRIBE" command:
- Pattern-Based Subscriptions: Subscribes to multiple channels using pattern matching, allowing clients to receive messages from channels that match a specified pattern.
- Event-Driven Architecture: Facilitates building event-driven architectures by enabling clients to listen for events on channels that follow naming conventions.
- Scalable Messaging: Supports scalable messaging systems by allowing clients to subscribe to a range of channels with a single pattern.
- Dynamic Channel Monitoring: Useful for monitoring and reacting to dynamic sets of channels without needing to know exact channel names in advance.
Syntax:
PSUBSCRIBE CHANNEL_NAME_OR_PATTERN [PATTERN...]
Following listing shows some supported patterens in redis
- h?llo subscribes to hello, hallo and hxllo
- h*llo subscribes to hllo and heeeello
- h[ae]llo subscribes to hello and hallo, but not hillo
Available since
2.0.0.
Example: Redis PSUBSCRIBE
redis 127.0.0.1:6379> PSUBSCRIBE mychannel Reading messages... (press Ctrl-C to quit) 1) "psubscribe" 2) "mychannel" 3) (integer) 1