//abcdefgh //20190923 const user_s = 'aacdddddddddfffffffffgghhh'; let result_s = ''; console.log(`${user_s.match(/a/g).length}${Number(user_s.match(/b/g))}${user_s.match(/c/g).length}${user_s.match(/d/g).length}${Number(user_s.match(/e/g))}${user_s.match(/f/g).length}${user_s.match(/g/g).length}${user_s.match(/h/g).length}`);