What is the regex for us zip code?

The regex pattern for us zip code is `^\d{5}(?:-\d{4})?$`. This pattern validates 5-digit zip or zip+4 format.

How do I use this regex in JavaScript?

In JavaScript, create the regex with `const regex = /^\d{5}(?:-\d{4})?$/;` and test with `regex.test(yourValue)`. It returns `true` if the value matches.

How do I use this regex in Python?

In Python, use `import re; re.match(r'^\d{5}(?:-\d{4})?$', value)`. The raw string prefix (`r`) prevents Python from interpreting backslashes as escape characters.

Is this regex case-sensitive?

By default, yes. To make it case-insensitive, add the `i` flag in JavaScript (`/^\d{5}(?:-\d{4})?$/i`) or use `re.IGNORECASE` in Python.

Regex for US ZIP Code

Regex Pattern

^\d{5}(?:-\d{4})?$

5-digit ZIP or ZIP+4 format

Quick Answer

The regex pattern for us zip code is `^\d{5}(?:-\d{4})?$`. 5-digit ZIP or ZIP+4 format. This works in JavaScript, Python, Ruby, PHP, Java, and most regex engines that support PCRE syntax.

Test Examples

Input	Result
12345	✓ Matches
90210	✓ Matches
12345-6789	✓ Matches
1234	✗ No match
123456	✗ No match
ABCDE	✗ No match

Code Examples

javascript

const regex = /^\d{5}(?:-\d{4})?$/;
const isValid = regex.test(value);

python

import re
pattern = r'^\d{5}(?:-\d{4})?$'
if re.match(pattern, value):
    print("valid")

ruby

pattern = /^\d{5}(?:-\d{4})?$/
if value =~ pattern
  puts "valid"
end

php

if (preg_match('/^\d{5}(?:-\d{4})?$/', $value)) {
    echo "valid";
}

java

String pattern = "^\\d{5}(?:-\\d{4})?$";
boolean isValid = value.matches(pattern);

Frequently Asked Questions

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