您针对这个对象运行一个正则表达式，提取用户代理字符串。
You run a regular expression against it to extract the user agent string.
如果需要XPath模式，除代理组配置以外还必须包含XPath表达式。
If XPath mode is required, an XPath expression must be included in addition to the Proxy Group configuration.
提供一组正则表达式来描述不使用代理的地址。
Provides a set of regular expressions that describe addresses that do not use a proxy.
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