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  1. or download this
    $reg = qr'foo';
$str = 'foo';
...
print "$reg -> $reg_ref\n";
print "$str -> $str_ref\n";
print "$str2 -> $str2_ref\n";
  2. or download this
    (?-xism:foo) -> REF(0x80635ac)
foo -> SCALAR(0x80635dc)
(?-xism:foo) -> SCALAR(0x8063600)