USER CODE FORMAT

User code can have different formats, depending on whether it is a NIF, NIE or passport. Specific:

- NIF: 8 Digits + '-' + Letter
Example:
  12345678-L

- NIE: With possible formats:
Examples:
  X-12345678-L
  X12345678
  X12345678-L
  X12345678L

- Passport: all digits and letters
Thesis Supervisor from another institution: Prefix: “T-“ + all the letters and numbers of the passport
Example:
  T-AB123456789

Other: all the letters and numbers of the passport
Example:
  AB123456789