formline with a format would probably do it. use strict;
my $str="Reports that say that something hasn't ".
"happened are always interesting to me " .
"because as we know, there are known knowns; ".
"there are things we know we know. We also ".
"know there are known unknowns; that is to ".
"say we know there are some things we do not ".
"know. But there are also unknown unknowns --".
" the ones we don't know we don't know.";
my $picture = '^<<<<<<<<<<<<<<<<<<<< ~~'."\n";
formline ($picture, $str);
print "$^A\n";
Adjust the picture variable to suite your needs. If the number of chars is variable, it is fairly simple to construct the format using the 'x' operator
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