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There are times when you may want to use the 9 digit zip code validation for US. The 9 digit zip code is usually in format like this #####-####. For a 9 digit US zip code validation use below regular Expression. ^([0-9]{5}-[0-9]{4})$.
Field Value. Validates that the account Billing Zip/Postal Code is valid. by looking up the first five characters of the value in a custom object. called Zip_Code__c that contains a record for every valid zip code in the. US. If the zip code is not found in the Zip_Code__c object, or the.