If you need codes of a specific length containing characters of a different types (uppercase, lowercase, digits, ...) you should "Generate using characterset". Codes like this are typically used for passwords and sweepstakes.
If you need codes that have a specific pattern (ie. XXX-9999-XX) you should "Generate using pattern". Codes like this are typically used for serial numbers and promotional codes.

A pattern can be defined by using the following characters:

  • X = Uppercase (A, B, C, ...)
  • x = Lowercase (a, b, c, ...)
  • 9 = Digits (0, 1, 2, ...)
  • A = Uppercase + digits (A, B, .. + 0, 1, ..)
  • a = Lowercase + digits (a, b, .. + 0, 1, ..)
  • # = Special characters ($, %, &, ...)
  • ! = Punctuation (!, ?, ...)
  • [ = Brackets ([, ], ...)
  • v = Vowels (a, e, i, ...)
  • c = Consonants (b, c, d, ...)
  • ? = Random from all characters above
  • / = Escape character

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