字符串在另一个JavaScript中出现的次数
我们需要编写一个JavaScript函数，该函数接受两个字符串并返回str1在str2中出现的次数计数。
示例
为此的代码将是-
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));输出结果
控制台中的输出-
4