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  1. or download this
    use strict;

...
$f1 = aa; $f2 = bb
$1 = aa; $2 = bb
$f1 = ; $f2 =
  2. or download this
    use strict;

...
$f1 = aa; $f2 = bb
$1 = XX; $2 = bb
$f1 = ; $f2 =
  3. or download this
    ($_ = "ABCD") =~ /(..)(..)/;
print "$1, $2\n";
...
__END__
AB, CD
AB, CD
  4. or download this
    () = ($_ = "ABCD") =~ /(..)(..)/;
print "$1, $2\n";
...
__END__
AB, CD
WX, YZ