Regex for UUID

Note

Checks the version digit (1–8) and the RFC 9562 variant bits (8, 9, a or b). Drop those two checks to accept any 8-4-4-4-12 hex string.

Matches in the example

• "550e8400-e29b-41d4-a716-446655440000"
• "01890a5d-ac96-774b-bcce-b302099a8057"

Token by token

1. \b a word boundary
2. [0-9a-f]{8} one of: “0” to “9” or “a” to “f”, exactly 8 times
3. - the character “-”
4. [0-9a-f]{4} one of: “0” to “9” or “a” to “f”, exactly 4 times
5. - the character “-”
6. [1-8] one of: “1” to “8”
7. [0-9a-f]{3} one of: “0” to “9” or “a” to “f”, exactly 3 times
8. - the character “-”
9. [89ab] one of: “8”, “9”, “a” or “b”
10. [0-9a-f]{3} one of: “0” to “9” or “a” to “f”, exactly 3 times
11. - the character “-”
12. [0-9a-f]{12} one of: “0” to “9” or “a” to “f”, exactly 12 times
13. \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