迭代器的接口，只能通过使用递增运算符向前访问容器中的元素。

Interface for an iterator that can access elements in a container only in the forward direction by using the increment operator.

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二次出现的字符串由一个指向前一字符串的指针(以对的形式——距离和长度)代替。

The second occurrence of a string is replaced by a pointer (in the form of a pair — distance and length) to the previous string.

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正则表达式中有修饰符，它们既可以在表达式内部也可以在表达式外部： 区别大小写、向前查找（lookahead）、多重匹配、忽略空格、匹配的数目等。

There are modifiers to the regular expressions, both inside and outside the expression: case-insensitivity, lookahead, multiple matches, ignoring whitespace, number of matches, and so on.

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