AngularJS filter to format IBAN accounts

iban.filter.js

(function() {
    'use strict';

    /**
     * Formats a string and returns a valid IBAN account string
     * @param  {string} input example: 'ES0123456789012345678901'
     * @return {string} output example: 'ES01 2345 6789 0123 4567 8901'
     * @example <caption>{{'ES0123456789012345678901' | IBAN}}</caption>
     */
    angular.module('app').filter('IBAN', () => iban => iban ? iban.replace(/[^\dA-Z]/g, '').replace(/(.{4})/g, '$1 ').trim() : '');

})();