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.

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Unicode字符集、模式内任意代码操作、flag toggles、条件表达式以及其他特征都被添加到正则表达式库中。

Unicode character class specifiers, arbitrary code execution inside a pattern, flag toggles, conditional expressions, and many other features were added to the regular expression engine.

youdao

确定字符串是否与模式匹配是对正则表达式的最简单应用，如图1所示，而且易于操作。

Determining if a string matches a pattern is the simplest use of regular expressions and, as you see in Figure 1, it's, easy to do.

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