02. Registration js exam

function solve(arg) {
  const numInput = Number(arg.shift());
  let sucRegCount = 0;
  const pat = /(U\$)(?<userName>[A-Z][a-z]{2,})\1(P@\$)(?<password>[A-Za-z]{5,}\d+)\3/g;

  for (let i = 0; i < numInput; i++) {
    const str = arg[i];
    const isValid = str.match(pat);

    if (isValid) {
      const regExResult = pat.exec(str);
      const { userName, password } = regExResult.groups;
      sucRegCount += 1;
      console.log('Registration was successful');
      console.log(`Username: ${userName}, Password: ${password}`);
    } else {
      console.log('Invalid username or password');
    }
  }

  console.log(`Successful registrations: ${sucRegCount}`);
}