activemq-artemis/docs/user-manual/en/wildcard-syntax.md

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# Wildcard Syntax
Apache ActiveMQ Artemis uses a specific syntax for representing wildcards in security
settings, address settings and when creating consumers.
The syntax is similar to that used by [AMQP](https://www.amqp.org).
An Apache ActiveMQ Artemis wildcard expression contains words delimited by the character
`.` (full stop).
The special characters `#` and `*` also have special meaning and can
take the place of a word.
The character `#` means "match any sequence of zero or more words".
The character `*` means "match a single word".
So the wildcard `news.europe.#` would match `news.europe`,
`news.europe.sport`, `news.europe.politics`, and
`news.europe.politics.regional` but would _not_ match `news.usa`,
`news.usa.sport` or `entertainment`.
The wildcard `news.*` would match `news.europe`, but not
`news.europe.sport`.
The wildcard `news.*.sport` would match `news.europe.sport` and also
`news.usa.sport`, but not `news.europe.politics`.
## Customizing the Syntax
It's possible to further configure the syntax of the wildcard addresses using the broker configuration.
For that, the `<wildcard-addresses>` configuration tag is used.
```xml
<wildcard-addresses>
<routing-enabled>true</routing-enabled>
<delimiter>.</delimiter>
<any-words>#</any-words>
<single-word>*</single-word>
</wildcard-addresses>
```
The example above shows the default configuration.