The handler function is called when the request type and the regular expression match.

当请求类型与正规表达式匹配时，就会调用处理器函数。

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The outermost parentheses in this regular expression match the beginning of the nested constructs.

这个正则里最外层的括号匹配了嵌套结构的开头。

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The cornerstone is the predicate matches, which allow for a regular expression match over an attribute (or all the attributes).

这一集成的基础是谓词匹配，它允许正则表达式在一个属性(或所有属性)之上匹配。

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