该包提供了一个引擎，可以通过解释模式对字符序列执行操作，即模式成为正则表达式的编译表达式。
This package offers an engine that performs operations on character sequences by interpreting patterns, a pattern being a compiled expression of a regular expression.
这次我还是要创建一个新的filter类型，向正则表达式传递一个名为rfilter的闭包，并执行一些assert，以确保每件事都正常。
Again, I'll create a new filter type, pass in the regular expression closure named rfilter and execute some asserts to ensure that everything is peachy. All of this is shown in Listing 3.
第二个闭包（在几个进行代码验证的 assert 之后出现）对指定的 String 应用正则表达式。
The second closure (which comes in after a few asserts for code validation) applies regular expressions to a given String.
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