Using this bit of documentation, here's what happens:

  • 1zz

    • 1zz doesn't match "/^[a-zA-Z]*[0-9]*\z/"

    Rule #1 - gets converted to a number, 1, which is then incremented to 2.

  • zzz

    • zzz matches "/^[a-zA-Z]*[0-9]*\z/"

    Rule #2 - the last z is incremented to a (stays in the same range, which is a-z), carries one over; second z is incremented to a, carries one over; first z is incremented to a, carries one over, which gets turned into an a.

  • zz1

    • zz1 matches "/^[a-zA-Z]*[0-9]*\z/"

    Rule #2 - 1 is incremented to 2.

  • z3z

    • z3z doesn't match "/^[a-zA-Z]*[0-9]*\z/"

    Rule #1 - the value is converted to numeric; since there are no digits before the first non-digit, the numeric value is 0; that value is then incremented to 1.

  • zz9

    • zz9 matches "/^[a-zA-Z]*[0-9]*\z/"

    Rule #2 - 9 is incremented to 0, carries one over, and then the process with the two zs is the same as from above.

    In reply to Re^2: Amusement in Auto-Increments by cog
    in thread Amusement in Auto-Increments by kiz

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