RegEx library
Email regex
Phone number regex
IP address regex
Date regex
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Numbers only regex (digits only)
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Regex match words
ZIP code regex
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ZIP code regex

ZIP code (US postal code) regular expression can be used to verify if a given string contains a valid ZIP code or extract ZIP code from a string. Supports both 5-digit and 9-digit (ZIP+4) formats.

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ZIP code regex

A regular expression to test a string against ZIP code format:

/^[0-9]{5}(?:-[0-9]{4})?$/
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/^[0-9]{5}(?:-[0-9]{4})?$/

True

False

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Example code in Javascript:

var zipRegex = /^[0-9]{5}(?:-[0-9]{4})?$/;
// Validate zip code
zipRegex.test('80001'); // Returns true
zipRegex.test('80001-2222'); // Returns true
zipRegex.test('800010'); // Returns false

// Extract zip code from a string
var zipRegexG = /[0-9]{5}(?:-[0-9]{4})?/g;
'My zip code is 80001'.match(zipRegexG); // returns ['80001']
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True

False

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True

False

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Notes on ZIP code validation and extraction

This ZIP code regex has several limitations:

  • It only works for US ZIP codes. If you need to support other countries, you might need to have a separate regular expression for each one of them and execute it based on the country provided.
  • It can not guarantee that ZIP code actually exists. For instance, 99999 is a correct format, but this ZIP code does not exist.
  • The extraction method can generate false-positive extraction if a string contains multiple numbers.