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。
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。
The find function then searches the episode list to find matches using a simple regular expression match on the title and the summary.
然后，find函数搜索剧集列表以便使用与标题和摘要匹配的简单正则表达式来查找匹配项。
It works correctly with undefined values as well, whereas with warnings turned on, a regular expression match on an undefined value will print a warning.
该函数也会正确地处理未定义的值，尽管在警告打开时，常规表达式在匹配未定义的值时会输出警告信息。
It works correctly with undefined values as well, whereas with warnings turned on, a regular expression match on an undefined value will print a warning.
该函数也会正确地处理未定义的值，尽管在警告打开时，常规表达式在匹配未定义的值时会输出警告信息。
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