它的叶子节点就好像一种略加扩展的源代码，而下一步便是把它转换为正则表达式引擎所使用的机器码。

Looking at just the leaf node, this resembles the source code to a fair extend. Next this is translated into the machine code of the regular expression engine.

youdao

并且您可以使用字母集合(就像您可能在正则表达式中使用的那样)，例如，用于列出具有“c”或“o”扩展名的文件，如清单2所示。

And you can use letter collections (as you might in a regular expression), for example, to list the files with a "c" or "o" extension, as shown in Listing 2.

youdao

并且您可以使用字母集合(就像您可能在正则表达式中使用的那样)，例如，用于列出具有“c”或“o”扩展名的文件，如清单2所示。

And you can use letter collections (as you might in a regular expression), for example, to list the files with a "c" or "o" extension, as shown in Listing 2.

youdao