ZIP Code US Postal Code validation

Question

I thought people would be working on little code projects together  but I don t see them  so here s an easy one   Code that validates a valid US Zip Code  I know there are ZIP code databases out there  but there are still uses  like web pages  quick validation  and also the fact that zip codes keep getting issued  so you might want to use weak validation   I wrote a little bit about zip codes in a side project on my wiki blog   https   benc fogbugz com default asp W24  There is also a new  weird type of zip code    https   benc fogbugz com default asp W42  I can do the javascript code  but it would be interesting to see how many languages we can get here

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Suggest you have a look at the USPS Address Information APIs  You can validate a zip and obtain standard formatted addresses  https   www usps com business web-tools-apis address-information htm

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One way to check valid Canada postal code is-  function isValidCAPostal pcVal       return   A-Za-z  0-9  A-Za-z  s 0 1  0-9  A-Za-z  0-9    test pcVal       Hope this will help someone

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Javascript Regex Literal   US Zip Codes       d 5       d 5 - d 4      var isValidZip       d 5       d 5 - d 4     test  90210      Some countries use Postal Codes  which would fail this pattern

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Drupal 7 also has an easy solution here  this will allow you to validate against multiple countries   https   drupal org project postal code validation  You will need this module as well  https   drupal org project postal code  Test it in http   simplytest me

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If you re doing for Canada remember that not all letters are valid  These letters are invalid  D  F  I  O  Q  or U And the letters W and Z are not used as the first letter  Also some people use an optional space after the 3rd character   Here is a regular expression for Canadian postal code   new RegExp    abceghjklmnprstvxy  0-9  abceghjklmnprstvwxyz  s  0-9  abceghjklmnprstvwxyz  0-9   i   The last i makes it case insensitive

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function isValidUSZip sZip       return    d 5  - d 4      test sZip

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This is a good JavaScript solution to the validation issue you have     b d 5 - d 4  b

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Here s a JavaScript function which validates a ZIP postal code based on a country code  It allows somewhat liberal formatting  You could add cases for other countries as well  Note that the default case allows empty postal codes since not all countries use them   function isValidPostalCode postalCode  countryCode        switch  countryCode            case  US               postalCodeRegex       0-9  5      - s    0-9  4                    break          case  CA               postalCodeRegex       A-Z  0-9  A-Z   s   0-9  A-Z  0-9                  break          default              postalCodeRegex         A-Z0-9    -    A-Z0-9                    return postalCodeRegex test postalCode       FYI The second link referring to vanity ZIP codes appears to have been an April Fool s joke

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Here s one from jQuery Validate plugin s additional-methods js file     jQuery validator addMethod  zipUS   function value  element        return     d 5       d 5 - d 4     test value       Please specify a valid US zip code         EDIT   Since the above code is part of the jQuery Validate plugin  it depends on the  addMethod   method   Remove dependency on plugins and make it more generic      function checkZip value        return      d 5       d 5 - d 4      test value        Example Usage   http   jsfiddle net 5PNcJ

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Are you referring to address validation  Like the previous answer by Mike  you need to cater for the othe 95    What you can do is when the user select s their country  then enable validation  Address validation and zipcode validation are 2 different things  Validating the ZIP is just making sure its integer  Address validation is validating the actual address for accuracy  preferably for mailing

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As I work in the mailing industry for 17 years I ve seen all kinds of data entry in this area I find it interesting how many people do not know their address as it is defined by the USPS   I still see addresses like this   XYZ College IT Department City  St  ZIP  The worst part is the mail 99  of the time is delivered  the other 1   well that is returned for an incomplete address as it should    In an earlier post someone mentioned USPS CASS  that software is not free   To regex a zip code tester is nice  I m using expressions to determine if US  CA  UK  or AU zip code  I ve seen expressions for Japan and others which only add challenges in choosing the correct country that a zip belongs to   By far the best answer is to use Drop Down Lists for State  and Country  Then use tables to further validate if needed   Just to give you an idea there are 84052 acceptable US City St Zip combinations on just the first 5 digits  There are 249 valid countries as per the ISO and there are 65 US State Territories   There are Military  PO Box only  and Unique zip code classes as well  KISS applies here

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To allow a user to enter a Canadian Postal code with lower case letters as well  the regex would need to look like this       a-zA-Z  0-9  a-zA-Z   s   0-9  a-zA-Z  0-9

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To further my answer  UPS and FedEx can not deliver to a PO BOX not without using the USPS as final handler  Most shipping software out there will not allow a PO Box zip for their standard services   Examples of PO Box zips are 00604 - RAMEY  PR and 06141 - HARTFORD  CT    The the whole need to validate zip codes can really be a question of how far do you go  what is the budget  what is the time line   Like anything with expressions test  test  test  and test again   I had an expression for State validation and found that YORK passed when it should fail   The one time in thousands someone entered New York  New York 10279  ugh   Also keep in mind  USPS does not like punctuation such as N  Market St  and also has very specific acceptable abbreviations for things like Lane  Place  North  Corporation and the like

[javascript] ZIP Code (US Postal Code) validation

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