02. Registration

function solve(input) {
  input.shift();
  let pattern = /\bU\$(?<username>[A-Z][a-z]{2,})U\$P@\$(?<password>[A-Za-z]{5,}\d+)P@\$\B/; // без g заради exec/match

  let validCounter = 0;

  input.forEach(line => {
    if (pattern.test(line)) {
      validCounter++;
      let valid = pattern.exec(line);
      if (valid) {
        console.log("Registration was successful");
        console.log(`Username: ${valid.groups["username"]}, Password: ${valid.groups["password"]}`);
      }
      //   let valid = line.match(pattern); // втори начин вместо exec и проверката
    } else {
      console.log("Invalid username or password");
    }
  });
  console.log(`Successful registrations: ${validCounter}`);
}