在反向引用uri时提供关于这些资源的有用信息。

Provide useful information about the resource when its URI is dereferenced.

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然后，您可以在规则部分将其名称放置在大括号内来反向引用它们

Then, you can refer back to them by putting their names in braces in the rules section

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当要使用多个反向引用时，正则表达式很快就会变得令人迷惑而且很难去理解。

When using multiple back references, a regular expression can quickly become confusing and hard to understand.

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