Open an in-memory filehandle and do a fixed-width read.

use Data::Dumper;

my $text = 'Your stuff goes here!' x 42;

# filehandle to read the contents of $text
open my $reader, '<', \$text;

# read 70 characters at a time 
local $/ = \70;

my @tokens = <$reader>;
print "Here are my tokens:\n", Dumper(\@tokens);
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