03. Spy Master js exam

function solve(args) {
  const specialKey = args.shift();
  let messagePattern = '((?: |^)';
  for (let i = 0; i < specialKey.length; i++) {
    messagePattern += `[${specialKey[i].toLowerCase()}${specialKey.toUpperCase()}]`;
  }

  messagePattern += '[ ]+)([!#$%A-Z]{8,})( |\\.|,|$)';
  const messageRegex = new RegExp(messagePattern, 'g');

  const replacer = (match, group1, group2, group3) => {
    group2 = group2.replace(/!/g, '1')
      .replace(/%/g, '2')
      .replace(/\#/g, '3')
      .replace(/\$/g, '4')
      .replace(/[A-Z]/g, (x) => x.toLowerCase());
    return group1 + group2 + group3;
  };


  for (let i = 0; i < args.length; i++) {
    const line = args[i].replace(messageRegex, replacer);
    console.log(line);
  }
}