The first step is to create a compatible regular expression out of each query word, although modification is only required if the word contains a wildcard character: *.

第一步是创建与每个查询词一致的正则表达式，只有在查询词包含通配符 * 时才需要修改。

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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Northern Air得以订阅所有机场的航班抵达信息。

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For example, you can use a wildcard character called a joker — a dot (.) that matches any character but one at the end of a line.

例如，可以使用称为百搭(joker)—一个句点(.)—的通配符，它可以与一行中除了最后一个字符以外的任何一个字符相匹配。

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