我从不建议使用正则表达式读取XML，但是有时它是兼容性最好的方式，因为正则表达式函数总是可用的。
I never recommend using regular expressions to read XML, but sometimes it's the most compatible way because the regular expression functions are always available.
URL模式：与Perl兼容的正则表达式字符串，将与客户端发送的URL进行匹配。
URL pattern: a Perl-compatible regular expression string to be matched with the URL sent by the client.
Match Expression：采用兼容 Perl 的正则表达式来匹配报头值。
Match Expression: Perl-compatible regular expression that matches against the value of the header.
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