http://perldoc.perl.org/perlfaq5.html#How-can-I-output-my-numbers-with-commas-added?
use warnings;
use strict;
my $bin = '1001100010100001';
print add_space($bin), "\n";
sub add_space {
# Add space separator
# Code adapted from perlfaq5: How can I output my numbers with com
+mas added?
local $_ = shift;
1 while s/^([01]+)([01]{4})/$1 $2/;
return $_;
}
__END__
1001 1000 1010 0001
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