题解 | #计算某字符出现次数#
计算某字符出现次数
http://www.nowcoder.com/practice/a35ce98431874e3a820dbe4b2d0508b1
正则表达式:
const str = readline();
const key = readline();
(() => {
const matchReg = new RegExp(`${key}`, 'ig')
const matchRes = str.match(matchReg) || []
console.log(matchRes.length)
})()