checkAddress zip usa

gistfile1.txt

const zipCodePattern = /^(0{4}[1-9]|0{3}[1-9]\d|0{2}[1-9]\d{2}|0[1-9]\d{3}|[1-9]\d{4}|99950)$/;

function checkAddress(address) {
  if (zipCodePattern.test(address)) {
    return "Valid ZIP code";
  } else {
    return "Not a valid ZIP code";
  }
}

console.log(checkAddress("00001")); // Valid ZIP code
console.log(checkAddress("12345")); // Valid ZIP code
console.log(checkAddress("99950")); // Valid ZIP code
console.log(checkAddress("99951")); // Not a valid ZIP code
console.log(checkAddress("00000")); // Not a valid ZIP code
console.log(checkAddress("123456")); // Not a valid ZIP code
console.log(checkAddress("abcde"));  // Not a valid ZIP code
console.log(checkAddress(""));       // Not a valid ZIP code