Question 1

What does the US ZIP Code regex pattern do?

Accepted Answer

Matches 5-digit US ZIP codes with optional +4 extension (hyphen followed by 4 digits). Word boundaries prevent partial matches.

Question 2

How do I use the US ZIP Code regex in JavaScript?

Accepted Answer

Use the pattern /\b\d{5}(?:-\d{4})?\b/g with the String.match() or String.matchAll() method. For example: const matches = text.match(/\b\d{5}(?:-\d{4})?\b/g);

Question 3

What regex flags does this pattern use?

Accepted Answer

This pattern uses the global flag (g). The global flag finds all matches in the input, not just the first.

Question 4

Which programming languages support this regex?

Accepted Answer

Fully supported in JS, PYTHON, JAVA, PHP. GO (Limited support (ASCII-only word boundaries))

Question 5

What strings does this regex match?

Accepted Answer

This pattern matches strings like: 90210, 10001-1234, 00000. It does not match strings like: 1234, 123456, ABCDE.

US ZIP Code

Pattern

Try It

Explanation

Test Strings

Matching

Non-matching

Language Compatibility

Code Snippets

Related Patterns

UK Postcode

Language	Support
JS	Full support
PYTHON	Full support
JAVA	Full support
PHP	Full support
GO	Limited support (ASCII-only word boundaries)