Regex to replace newlines not working on nodejs as intended

I have regex which I have tested on regex101 however when I use the same in nodejs it does not replace the newlines. The regex is /([ ]*\n)+/gm. It is supposed to replace multiple newlines with a single newline. The code is as follows. This code is a part of my vscode extension. Can someone tell me what I am doing wrong?

function format(str) {
    const regex = /([ ]*\n)+/gm;
    const subst = `\n`;
    const result = str.replace(regex, subst);
    return result;
}

function format(str) {
  const regex = /([ ]*\n)+/gm;
  const subst = `\n`;
  const result = str.replace(regex, subst);
  return result;
}


console.log(format(`abc
      
d

s




  

             

s`));