edwinmunguia

const validPhoneNumberRegex = /^(2|3|8|9)\d{3}-?\d{4}$/;
const isValidPhoneNumber = (input) => validPhoneNumberRegex.test(input);

//Test cases
//Valid number
if (isValidPhoneNumber("9837-4050")) console.log("Valid");
  else console.log("Invalid");
//Invalid numbers
if (isValidPhoneNumber("78374050")) console.log("Valid");
  else console.log("Invalid");