javascript - 在字符串中用 (variable*percentage)/100 替换 %[variable, percentage] 的最佳方法是什么？

Question

我有一个字符串，其中可能出现 %[{variable}, percentage] 我想将其转换为 (({variable}*percentage)/100) 并将其替换在同一位置。最好的方法是什么？

示例:{operation} + %[{cost}, 10] 应转换为 {operation} + (({cost}*10)/100)

我尝试了以下但没有成功:

function Service(){
    this.percentageRegx = "\%\[(.*?)]";
    this.percentageVariableRegx = "\%\[(.*?)]";
    this.percentageValueRegx = "\,(.*?)]";

   this.getPercentageFromFormula = function (formula) {
        var data = [];

        try {
            do {
                m = self.percentageRegx.exec(formula);
                if (m) {
                    var variableData = self.percentageVariableRegx.exec(m[1]),
                        percentageData = self.percentageValueRegx.exec(m[1]);

                    if(variableData !== null && percentageData !== null){
                        data.push({
                            string: m[1],
                            variable: variableData[1],
                            percentage: percentageData[1]
                        });
                    }
                }
            } while (m);
        } catch (e) {}

        return data;
    };

    /**
     * Convert percentages to formula
     */
    this.replacePercentageToFormula = function (formula) {
        var percentages = self.getPercentageFromFormula(formula);

        angular.forEach(percentages, function (percentage) {
            formula.replace(percentage.string,"(("+percentage.variable+"*"+percentage.percentage+")/100)");
        });

        return formula;
    };
}
var service = new Service();

formula = service.replacePercentageToFormula("{operation} + %[{cost}, 10]");

它给我 Uncaught SyntaxError: Invalid or unexpected token error

Answer 1

在我看来这是一个简单的基于正则表达式的单行字符串替换代码:

var input = "{operation} + %[{cost}, 10]    {?} * %[{123}, 5]";

var output = input.replace(/%\[(\{[^}]+\}), *(\d+)\]/g, "(($1*$2)/100)");

console.log(output);