uuid

Pattern: 
'[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-' 
 '[0-9a-fA-F]{4}-[0-9a-fA-F]{12}' 

A Universally Unique IDentifier in the string representation defined in RFC 4122. The canonical representation uses lowercase characters. The following is an example of a UUID in string representation: f81d4fae-7dec-11d0-a765-00a0c91e6bf6.

Reference:

  • RFC 4122: A Universally Unique IDentifier (UUID) URN Namespace