求关于解析四则运算公式中所有变量的正则表达式？

Question

let formula = '(@money+@tax)/@water_fee*100-(@fee5+@fee4)'

怎么用正则去匹配@符号后边的变量得到变量数组：

['@money','@tex','@water_fee','@fee5','@fee4']

Answer 1

可以直接用matchAll, 或者match:

let variables = [...formula.matchAll(/@\w+/g)].map(item => item[0]);
let variables2 = formula.match(/@\w+/g);

希望能帮助到你。

Answer 2

var formula = '(@money+@tax)/@water_fee*100-(@fee5+@fee4)'
var reg = /@(.*?)[+-/*(\)]/g, b, list=[];
while(true) { 
    b = reg.exec(formula);
    if (!b) break;
    list.push(b[1]);
}
console.log(list)
    

Answer 3

    let formula = '(@money+@tax)/@water_fee*100-(@fee5+@fee4)';
    const reg = /(@\w+)/g
    console.log(formula.match(reg));