isPostalCode.js

import assertString from './util/assertString';

// common patterns
const threeDigit = /^\d{3}$/;
const fourDigit = /^\d{4}$/;
const fiveDigit = /^\d{5}$/;
const sixDigit = /^\d{6}$/;

const patterns = {
  AD: /^AD\d{3}$/,
  AT: fourDigit,
  AU: fourDigit,
  BE: fourDigit,
  BG: fourDigit,
  CA: /^[ABCEGHJKLMNPRSTVXY]\d[ABCEGHJ-NPRSTV-Z][\s\-]?\d[ABCEGHJ-NPRSTV-Z]\d$/i,
  CH: fourDigit,
  CZ: /^\d{3}\s?\d{2}$/,
  DE: fiveDigit,
  DK: fourDigit,
  DZ: fiveDigit,
  EE: fiveDigit,
  ES: fiveDigit,
  FI: fiveDigit,
  FR: /^\d{2}\s?\d{3}$/,
  GB: /^(gir\s?0aa|[a-z]{1,2}\d[\da-z]?\s?(\d[a-z]{2})?)$/i,
  GR: /^\d{3}\s?\d{2}$/,
  HR: /^([1-5]\d{4}$)/,
  HU: fourDigit,
  ID: fiveDigit,
  IL: fiveDigit,
  IN: sixDigit,
  IS: threeDigit,
  IT: fiveDigit,
  JP: /^\d{3}\-\d{4}$/,
  KE: fiveDigit,
  LI: /^(948[5-9]|949[0-7])$/,
  LT: /^LT\-\d{5}$/,
  LU: fourDigit,
  LV: /^LV\-\d{4}$/,
  MX: fiveDigit,
  NL: /^\d{4}\s?[a-z]{2}$/i,
  NO: fourDigit,
  PL: /^\d{2}\-\d{3}$/,
  PT: /^\d{4}\-\d{3}?$/,
  RO: sixDigit,
  RU: sixDigit,
  SA: fiveDigit,
  SE: /^\d{3}\s?\d{2}$/,
  SI: fourDigit,
  SK: /^\d{3}\s?\d{2}$/,
  TN: fourDigit,
  TW: /^\d{3}(\d{2})?$/,
  UA: fiveDigit,
  US: /^\d{5}(-\d{4})?$/,
  ZA: fourDigit,
  ZM: fiveDigit,
};

export const locales = Object.keys(patterns);

export default function (str, locale) {
  assertString(str);
  if (locale in patterns) {
    return patterns[locale].test(str);
  } else if (locale === 'any') {
    for (const key in patterns) {
      // https://github.com/gotwarlost/istanbul/blob/master/ignoring-code-for-coverage.md#ignoring-code-for-coverage-purposes
      // istanbul ignore else
      if (patterns.hasOwnProperty(key)) {
        const pattern = patterns[key];
        if (pattern.test(str)) {
          return true;
        }
      }
    }
    return false;
  }
  throw new Error(`Invalid locale '${locale}'`);
}