题解 | #统计字符#

代码简化成功！

const rl = require("readline").createInterface({ input: process.stdin, output: process.stdout });

rl.on('line', line => {
    let arr = [/[a-z]/ig, /\s/g, /[0-9]/g, /[^a-z0-9\s]/ig]
    for(let i = 0; i < arr.length; i++){
        let res = line.match(arr[i]) ? line.match(arr[i]).join('').length : 0
        console.log(res)
    }
})