Regex for US ZIP code

Note

Five digits, optionally with a ZIP+4 extension. It cannot tell a ZIP from any other five-digit number.

Matches in the example

• "94103"
• "10001-1234"

Token by token

1. \b a word boundary
2. \d{5} a digit (0–9), exactly 5 times
3. (?: a group, not capturing
4. - the character “-”
5. \d{4} a digit (0–9), exactly 4 times
6. )? end of group, whole group optionally
7. \b a word boundary

Other patterns

• Email address
• URL
• IPv4 address
• UUID
• Hex color
• Date (YYYY-MM-DD)
• Time (24-hour)
• US phone number
• Phone number (E.164)
• US ZIP code
• Credit card number
• URL slug
• Username
• Strong password
• HTML tag
• Semantic version
• MAC address
• JSON Web Token
• Hashtag
• @mention
• Number
• Leading and trailing whitespace
• Repeated word
• Blank lines
• Markdown link
• Quoted string
• Domain name
• File extension
• Base64
• Trailing comma