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Validation
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Regex for UUID v4

UUID v4 patterns help validate request IDs, webhook event IDs, and client-generated identifiers without accepting the wrong version bit.

Regex
/^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i

Try this pattern

Matches current input
550e8400-e29b-41d4-a716-446655440000

1 match found in the current text.

Passing examples

  • 550e8400-e29b-41d4-a716-446655440000
  • 987fbc97-4bed-4078-8f07-9141ba07c9f3

Failing examples

  • 550e8400-e29b-11d4-a716-446655440000
  • not-a-uuid

Code examples

JavaScript
const regex = /^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
regex.test(input);
Python
import re
pattern = re.compile(r"^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$", re.IGNORECASE)
bool(pattern.search(input))
Go
re := regexp.MustCompile("(?i)^[0-9a-f]{8}-[0-9a-f]{4}-4[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$")
matched := re.MatchString(input)

Related Validation Patterns

Regex for Valid Email Address
/^[^\s@]+@[^\s@]+\.[^\s@]+$/i
Regex for URL Slug
/^[a-z0-9]+(?:-[a-z0-9]+)*$/
Regex for Strong Password
/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[^A-Za-z\d]).{12,}$/
Regex for IPv4 Address
/^(?:25[0-5]|2[0-4]\d|1?\d?\d)(?:\.(?:25[0-5]|2[0-4]\d|1?\d?\d)){3}$/
Regex for Hex Color
/^#?(?:[0-9a-fA-F]{3}|[0-9a-fA-F]{6})$/
Regex for Semantic Version
/^(0|[1-9]\d*)\.(0|[1-9]\d*)\.(0|[1-9]\d*)(?:-[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?(?:\+[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?$/