Regex for valid zip codes.

_zip-code-regex.md

Zip code validation

These are a few examples of how to validate various zip code formats.

In the following examples, A represents any letter and 9 means any number.

Read more here…

https://en.wikipedia.org/wiki/Postal_codes_in_Canada

https://en.wikipedia.org/wiki/List_of_postal_codes_in_Mexico

https://en.wikipedia.org/wiki/Postcodes_in_the_United_Kingdom

https://en.wikipedia.org/wiki/ZIP_Code

validZipCodeCA.js

/*
  Example usage:

  // Logs `true`.
  console.log(
    validZipCodeCA('A9A 9A9')
  );
*/
const validZipCodeCA = (value = '') => {
  // Clean up.
  const newValue = String(value).trim().replace(/\s+/g, ' ');

  // Get boolean.
  const bool = !!newValue.match(/^[A-Z][0-9][A-Z]\s[0-9][A-Z][0-9]$/i);

  // Expose boolean.
  return bool;
};

validZipCodeMX.js

/*
  Example usage:

  // Logs `true`.
  console.log(
    validZipCodeMX('99999')
  );

  // Logs `true`.
  console.log(
    validZipCodeMX('99999-99999')
  );
*/
const validZipCodeMX = (value = '') => {
  // Clean up.
  const newValue = String(value).trim().replace(/\s+/g, ' ');

  // Get boolean.
  const bool = !!(
    // "99999"
    newValue.match(/^[0-9]{5}$/) ||

    // "99999-99999"
    newValue.match(/^[0-9]{5}-[0-9]{5}$/)
  );

  // Expose boolean.
  return bool;
};

validZipCodeUK.js

/*
  Example usage:

  // Logs `true`.
  console.log(
    validZipCodeUK('AA9A 9AA')
  );

  // Logs `true`.
  console.log(
    validZipCodeUK('A9A 9AA')
  );

  // Logs `true`.
  console.log(
    validZipCodeUK('A9 9AA')
  );

  // Logs `true`.
  console.log(
    validZipCodeUK('A99 9AA')
  );

  // Logs `true`.
  console.log(
    validZipCodeUK('AA9 9AA')
  );

  // Logs `true`.
  console.log(
    validZipCodeUK('AA99 9AA')
  );
*/
const validZipCodeUK = (value = '') => {
  // Clean up.
  const newValue = String(value).trim().replace(/\s+/g, ' ');

  // Get boolean.
  const bool = !!(
    // "AA9A 9AA"
    newValue.match(/^[A-Z][A-Z][0-9][A-Z]\s[0-9][A-Z][A-Z]$/i) ||

    // "A9A 9AA"
    newValue.match(/^[A-Z][0-9][A-Z]\s[0-9][A-Z][A-Z]$/i) ||

    // "A9 9AA"
    newValue.match(/^[A-Z][0-9]\s[0-9][A-Z][A-Z]$/i) ||

    // "A99 9AA"
    newValue.match(/^[A-Z][1-9][1-9]\s[1-9][A-Z][A-Z]$/i) ||

    // "AA9 9AA"
    newValue.match(/^[A-Z][A-Z][0-9]\s[0-9][A-Z][A-Z]$/i) ||

    // "AA99 9AA"
    newValue.match(/^[A-Z][A-Z][0-9][0-9]\s[0-9][A-Z][A-Z]$/i)
  );

  // Expose boolean.
  return bool;
};

validZipCodeUS.js

/*
  Example usage:

  // Logs `true`.
  console.log(
    validZipCodeUS('99999')
  );

  // Logs `true`.
  console.log(
    validZipCodeUS('99999-9999')
  );
*/
const validZipCodeUS = (value = '') => {
  // Clean up.
  const newValue = String(value).trim().replace(/\s+/g, ' ');

  // Get boolean.
  const bool = !!(
    // "99999"
    newValue.match(/^[0-9]{5}$/) ||

    // "99999-9999"
    newValue.match(/^[0-9]{5}-[0-9]{4}$/)
  );

  // Expose boolean.
  return bool;
};