First, the key value for a threshold definition is a regular expression.

首先，阀值定义的关键值是一个正则表达式。

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Remember that the instant messaging client was extended to analyze and scan the messages for particular key phrases, as specified through a regular expression in the initialization file.

正如前面提到的，插件扩展了即时消息传递客户机，它会根据初始化文件中的正则表达式，分析消息并寻找特定的关键词。

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