# Understanding the ActiveMQ Wildcard Syntax

ActiveMQ 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](http://www.amqp.org).

An ActiveMQ 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' nor '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'.