用正则表达式替换 Javascript 中的算术运算符 [英] Regular Expression to replace arithmetic operators in Javascript

问题描述

我有一个包含算术运算符的字符串数组，我想用新的算术运算符替换数组中的那些算术运算符.

I have an array of string that contains arithmetic operators and I would like to replace those arithmetic operators in the array with a new arithmetic operator.

例如:

var equation = '5.0 + 9.34 - 6.0 * 2.1 * 3.1 / 2.0';

var newEquation = equation.replace(/+-*//, '+');

但是，它不会更改为想要的结果.请指教.非常感谢您的贡献.

However, it does not change to the wanted result. Please advise. Your contribution is much appreciated.

推荐答案

Use character class([])

var equation = '5.0 + 9.34 - 6.0 * 2.1 * 3.1 / 2.0';

var newEquation = equation.replace(/[+*\/-]/g, '+');
// or : equation.replace(/[+\-*/]/g, '+');

console.log(newEquation);

<小时>更新:为了避免负数，请使用否定前瞻断言和捕获组.

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UPDATE : For avoiding negative numbers use negative look-ahead assertion and capturing group.

var equation = '-5.0 + 9.34 - 6.0 * -2.1 * 3.1 / -2.0';

var newEquation = equation.replace(/(?!^-)[+*\/-](\s?-)?/g, '+$1');

console.log(newEquation);

此处为正则表达式说明

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