事实上，基于ooxml和odf的系统都使用压缩的xml格式，这意味着可以直接与数据交互以及从这两个系统抽取可重用的MathML表达式。
However, the fact that both OOXML and ODF based systems use zipped XML formats means that it is possible to directly interact with the data and extract reusable MathML expressions from either system.
matcher对象需要解释正则表达式并抽取所需的信息。
The matcher object needs to interpret the regular expression and extract the information needed. This is done in a single line.
它然后解析用户提交的内容，通过一个简单的正则表达式抽取出主体中找到的所有url。
It then parses the content submitted by the user, extracting all the URLs found within the body by means of a simple regular expression.
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