How to split and join a text considering special characters?

My Input is this: 'z<*zj'; I am looking a Output as : j<*zz;

here in this string, special characters not changed in position. But the letters arranged reversed alphabets. I am trying to get the output, but not works.

any one help me with shortest and correct way to get this?

my try:

const  Reverser = (str)  =>{
  return str.replace(/[a-zA-Z]+/gm,  (item) => {
    return item.split('')[0].split('')
  });
}

const result = Reverser('z<*zj');
console.log(result);

Thanks in advance

Answer

Not sure if I understand you correctly.
But I think you want to sort only the letters without changing non-letters?

Here is my approach:

const Reverser = (str) => {

  // create sorted array of all letters found
  // first remove all non-letters, then split into array
  // then sort in reverse so that we can use fast .pop() instead of slow .shift()

  let letters = str.replace(/[^a-zA-Z]+/gm,  '').split('').sort().reverse();

  // find letters and replace them with those in array, one by one

  return str.replace(/[a-zA-Z]/gm,  () => {
    return letters.pop();
  });
}

console.log(Reverser('z<*zj')); // j<*zz
console.log(Reverser('xy-a=cb')); // ab-c=xy