计算一个字符串在另一个字符串中的出现次数 - JavaScript

javascriptweb developmentfront end technologyobject oriented programming更新于 2025/11/24 20:28:17

我们需要编写一个 JavaScript 函数，该函数接受两个字符串并返回第一个字符串在第二个字符串中出现的次数

假设我们的字符串是 −

const main = 'This is the main is string';

我们必须在上面的"main"字符串中找到下面字符串的出现次数 −

const sub = 'is';

让我们来编写该函数的代码 −

示例

const main = 'This is the is main is string';
const sub = 'is';
const countAppearances = (main, sub) => {
   const regex = new RegExp(sub, "g");
   let count = 0;
   main.replace(regex, (a, b) => {
      count++;
   });
   return count;
};
console.log(countAppearances(main, sub));