function formatUSPhoneNumbers(phonenumber) {
// Remove all non-digit chars
const digits = phonenumber.replace(/\D/g, '');
// Apply (XXX) XXX-XXXX format
// match: the full matched string (e.g., "1234567890")
// countrycode: match from the first optional group (1)?
// x, y, z: matches from the next three-digit groups of 3, 3, and 4 digits respectively
return digits.replace(/^(1)?(\d{3})(\d{3})(\d{4})$/, (match, countrycode, x, y, z) => {
const prefix = countrycode ? '+1 ' : '';
return `${prefix}(${x}) ${y}-${z}`;
});
}
console.log(formatUSPhoneNumbers('AZ123-456-7890Y'));
console.log(formatUSPhoneNumbers('123.456.7890'));
console.log(formatUSPhoneNumbers('+1 123 456 7890'));
/*
run:
(123) 456-7890
(123) 456-7890
+1 (123) 456-7890
*/
