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### Re^2: Amusement in Auto-Increments

by cog (Parson)
 on Jul 22, 2009 at 20:52 UTC ( #782437=note: print w/replies, xml ) Need Help??

in reply to Re: Amusement in Auto-Increments

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.

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