Format a number in a paragraph

reformatPolicyNumbers.js

function reformatPolicyNumbers(paragraph) {
  const policyNumbers = paragraph.split(" ");

  policyNumbers.map((word, index) => {
    const policyNumber = word.split("-");

    if (policyNumber.length === 3 && !isNaN(Number(policyNumber.join("")))) {
      policyNumbers[index] = policyNumber.join("/");
    }
  });

  return policyNumbers.join(" ");
}

const paragraph1 = "Your long-term policy number is 12-39-8552";

const paragraph2 =
  "Your long-term policy number is 12-39-8552 and short term policy number is 65-98-789";

const paragraph3 = "Your 1st-policy-number policy number is 12-39-8552";

console.log(reformatPolicyNumbers(paragraph1)); // Your long-term policy number is 12/39/8552
console.log(reformatPolicyNumbers(paragraph2)); // Your long-term policy number is 12/39/8552 and short term policy number is 65/98/789
console.log(reformatPolicyNumbers(paragraph3)); // Your 1st-policy-number policy number is 12/39/8552