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Adding a subject example with a mix of wildcards

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Signed-off-by: Matthias Hanel <mh@synadia.com>
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Matthias Hanel 2020-02-03 20:24:42 -05:00
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nats-concepts/subjects.md
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# Subject-Based Messaging # Subject-Based Messaging
Fundamentally NATS is about publishing and listening for messages. Both of these depend heavily on _Subjects_ which scope messages into streams or topics. At its simplest, a subject is just a string of characters that form a name the publisher and subscriber can use to find each other. Fundamentally, NATS is about publishing and listening for messages. Both of these depend heavily on _Subjects_ which scope messages into streams or topics. At its simplest, a subject is just a string of characters that form a name the publisher and subscriber can use to find each other.
![](../.gitbook/assets/subjects1.svg) ![](../.gitbook/assets/subjects1.svg)
@ -38,3 +38,6 @@ The second wildcard is `>` which will match one or more tokens, and can only app
Subject to your security configuration, wildcards can be used for monitoring by creating something sometimes called a _wire tap_. In the simplest case you can create a subscriber for `>`. This application will receive all messages -- again, subject to security settings -- sent on your NATS cluster. Subject to your security configuration, wildcards can be used for monitoring by creating something sometimes called a _wire tap_. In the simplest case you can create a subscriber for `>`. This application will receive all messages -- again, subject to security settings -- sent on your NATS cluster.
### Mix Wildcards
The wildcard `*` can appear multiple times in the same subject. Both types be used as well. For example, `*.*.*.>` will receive `time.us.east.atlanta` as it is at least 4 tokens long.