Function isPhoneNumber

lib/utils.ts:460–479

(string: string)

}

export function isPhoneNumber(string: string): boolean {
  // Below regex checks for the format of a phone number. It's a little loose since it
  // has to allow country codes and different formatting of spaces, hyphens and brackets.
  // We have further sanity checks below (no letters, right number of numbers)
  const phoneNumRegex =
    /^(\+?\d{1,3}[-.\s]?)?\(?\d{1,3}\)?[-.\s]?(\d{1,2})?[-.\s]?(\d{3,4})?[-.\s]?(\d{3,9})$/;

  const broadlyRightFormat = phoneNumRegex.test(string);
  if (!broadlyRightFormat) return false;

  // Check if right number of numbers
  const numberCount = string.replace(/\D/g, "").length;
  // Reason for 10-13 range is phone numbers have 11 numbers, but there's an optional 0
  // at the front and country code can add 3 (e.g. +44) which replaces the 0
  // (strictly speaking, a country code can add >3, but these countries are rare)
  const numberCountCorrect = 10 <= numberCount && numberCount <= 13;
  if (!numberCountCorrect) return false;
  // Check if there are any letters
  return !/[a-z]/i.test(string);
}

export function isName(string: string): boolean {
  // Check for strings with no numbers, optionally capitalised first letters