题解 | #统计字符#

const readline = require('readline');

const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
});
rl.on('line', function (line) {
    const reg0 = /[a-zA-Z]/;
    const reg2 = /\d/;
    const reg3 = /[^a-z^A-Z^\d^\s]/;// 没用到 发现^匹配不到 干脆不用 走eles就行了
    const res = [0,0,0,0]
    for(let char of line){
      if(reg0.test(char)){
        res[0]+=1;
        continue
      }
      if(char===" "){
        res[1]+=1;
        continue
      }
      if(reg2.test(char)){
        res[2]+=1;
        continue
      }
     
        res[3]+=1;

    }
    for(let item of res){
        console.log(item)
    }
});