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A _pattern_ matches an address that corresponds to a pattern. A pattern is a sequence of words delimited by either a `.` or `/` character. You can use wildcard characters to represent a word. The  `*` character matches exactly one word, and the `#` character matches any sequence of zero or more words.
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The `*` and `#` characters are reserved as wildcards. Therefore, you should not use them in the message address.
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For more information about creating address patterns, see xref:address-pattern-matching-{context}[].
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[NOTE]
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You can convert a `prefix` value to a `pattern` by appending `/\#` to it. For example, the prefix `a/b/c` is equivalent to the pattern `a/b/c/#`.
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