Sample expressions are shown in Table 3.
样例表达式展示在表3中。
The following sections describe some sample filter expressions.
接下来将描述一些样例筛选器表达式。
It also leaves as an exercise for the reader several enhancements to the way the sample code USES regular expressions.
它还为读者留下了一个练习，要求读者对示例代码使用正则表达式的方式作一些改进。
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