arithmetic expression parser 算术表达式的语法分析器
MathHead_E mathematical expression parser for the preparation of their own use of calculators!
数学表达式解析器，适合编写自己使用的计算器！
Here's a sample application that instantiates your parser and feeds it an expression that you hardwired in at the top of the app.
下面是一个样本应用程序，它实例化您的解析器，并且为它提供了一个硬连接在应用程序顶部的表达式。
The schema parser must have support for regular expression facets.
模式解析器必须支持正则表达式。
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