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.

youdao

将字符看作一个单元而不是一个字节序列，这是进行多字节字符的字符串操作的必要条件。

Recognizing the character as a single, unit as opposed to a sequence of bytes, is a requirement in the case of string manipulations involving multi-byte characters.

youdao

一旦将字符串分解成序列，就可以用新的序列操作函数如insert - before来修改它。

Once you separate the string into a sequence, you can also use the new sequence-manipulation functions, such as insert-before , to alter it.

youdao

You don't see strings with commas between them, but it has the same kind of property. It is in ordered sequence of characters.

它是有序的字符序列,我们可以对字符串做同样的操作,我们也可以得到字符串中的一块。

麻省理工公开课 - 计算机科学及编程导论课程节选