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single-level wildcard

The + in a topic filter, standing for exactly one level of the topic.

The single-level wildcard + matches any one complete topic level, so home/+/temp matches home/kitchen/temp but not home/kitchen/oven/temp.

Examples

  • gh/+/temp matches gh/bench1/temp and gh/bench2/temp, but not gh/bench1/air/temp.

  • gh/bench+/temp is invalid: a + must fill a whole level by itself.

See also

multi-level wildcard topic filter topic
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