@substr = unpack "A$size" x ( 1 + length( $str ) / $size ), $str;

[download]

Or maybe

@substr = unpack "A$size" x POSIX::ceil( length( $str ) / $size ), $st
+r;

[download]

Makeshifts last the longest.

In reply to Re: Eliminating substr warnings by Aristotle
in thread Eliminating substr warnings by ezekiel

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