74 lines
1.8 KiB
Plaintext
74 lines
1.8 KiB
Plaintext
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= Wildcard Syntax
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:idprefix:
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:idseparator: -
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Apache ActiveMQ Artemis uses a specific syntax for representing wildcards in security settings, address settings and when creating consumers.
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The syntax is similar to that used by https://www.amqp.org[AMQP].
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An Apache ActiveMQ Artemis wildcard expression contains *words separated by a delimiter*.
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The default delimiter is `.` (full stop).
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The special characters `#` and `*` also have special meaning and can take the place of a *word*.
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To be clear, the wildcard characters cannot be used like wildcards in a https://en.wikipedia.org/wiki/Regular_expression[regular expression].
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They operate exclusively on *words separated by a delimiter*.
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== Matching Any Word
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The character `#` means "match any sequence of zero or more words".
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So the wildcard `news.europe.#` would match:
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* `news.europe`
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* `news.europe.sport`
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* `news.europe.politics`
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* `news.europe.politics.regional`
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But `news.europe.#` would _not_ match:
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* `news.usa`
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* `news.usa.sport`
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* `entertainment`
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== Matching a Single Word
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The character `*` means "match a single word".
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The wildcard `news.*` would match:
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* `news.europe`
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* `news.usa`
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But `news.*` would _not_ match:
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* `news.europe.sport`
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* `news.usa.sport`
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* `news.europe.politics.regional`
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The wildcard `news.*.sport` would match:
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* `news.europe.sport`
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* `news.usa.sport`
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But `news.*.sport` would _not_ match:
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* `news.europe.politics`
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== Customizing the Syntax
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It's possible to further configure the syntax of the wildcard addresses using the broker configuration.
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For that, the `<wildcard-addresses>` configuration tag is used.
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[,xml]
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----
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<wildcard-addresses>
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<routing-enabled>true</routing-enabled>
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<delimiter>.</delimiter>
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<any-words>#</any-words>
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<single-word>*</single-word>
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</wildcard-addresses>
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----
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The example above shows the default configuration.
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