Yep, I tried with defined first because that's the way I thought it worked, too. With that, the result of mine is, 

 abc  def  ghi  jkl  mno  pqr  stu  vwx yz

[download]
Note the extra spaces, indicating that there are defined empty strings instead of undefs in those positions.

Update: Good idea, ikegami++.

After Compline,
Zaxo

In reply to Re^3: Using split() to divide a string by length by Zaxo
in thread Using split() to divide a string by length by japhy

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