This topic string USES the special wildcard + character, which enables Northern air to subscribe to arrivals for all airports.
此主题字符串使用了特殊的通配符+字符，它让NorthernAir得以订阅所有机场的航班抵达信息。
A subscriber (but not a publisher) can specify a topic name that contains wildcard characters, which creates a single subscription to multiple topics, such as a branch in a topic hierarchy.
订户(而非发布者)可以指定包含通配符的主题名称，这将创建订阅多个主题的单个订阅，如主题层次结构中的某个分支。
The match may be exact if the publisher and subscriber specify exactly the same topic name, or the subscriber may specify a wildcard to match many different published topics.
如果发布方和订阅方指定的是完全相同的主题名称，则可能是精确匹配，否则订阅方可以指定通配符来匹配很多不同的发布主题。
This topic explains only how to find and optionally replace wildcard characters.
本主题仅说明如何查找并有选择地替换通配符。
This topic explains only how to find and optionally replace wildcard characters.
本主题仅说明如何查找并有选择地替换通配符。
应用推荐