Python数学正则表达式 [英] Python Math Regex

问题描述

我正在用Python创建一种编程语言，而基本语言所缺少的一个主要组件是解析数学方程式的能力.我具有解析数学的功能，但我需要能够检查输入是否为数学方程式.我正在寻找一个正则表达式来匹配3 * x ^(4 * y)+ 1-(7 * y * z/x)之类的东西.

I am creating a programming language in Python and one main component that I'm missing for the basic language is the ability to parse mathematical equations. I have the function to parse the math but I need to be able to check if the input is a math equation. I'm looking for a regex to match something like 3*x^(4*y)+1-(7*y*z/x).

推荐答案

您不能用正则表达式来做您想做的事，因为它不是正则语言. Python具有一些扩展，您可能会滥用这些扩展来执行您想要的操作，但是它将无法维护，并且不会因使用解析器而获得任何收益.

You can't do what you want with regular expressions, it isn't a regular language. Python has extensions that you could abuse to do what you want but it would be un-maintainable and would not gain you anything over using a parser.

您想要的是一个解析器，一个非常易于使用的Python库称为 pyparsing .

What you want is a Parser, a great easy to use library for Python is called pyparsing.

这是一个与相关的答案，并提供了一个pyparsing示例 a>.

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