当从原始的输入数据中提取字符串时，试着从原始字符串返回一个子字符串，而不是创建一份拷贝。

When extracting strings from a set of input data, try to return a substring of the original data, instead of creating a copy.

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这类似于我们在正则表达式中使用“捕捉组”来提取我们需要的子字符串时来替代把一个字符串分隔成好几个的方法。

It is analogous to using "capture groups" in a regular expression to pull out substrings we want, instead of splitting the string in several successive steps to extract the substrings we want.

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提取子字符串并操作字符串的多个部分。

Extracting substrings and manipulating parts of the string.

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