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  1. or download this
    $_ = <<'HTML';
<a href="http://www.foobar.com/xxx">
...
s{(href="http://(?!www\.danheller\.com)[^"]+")}{$1 target="_blank"}g;

print;
  2. or download this
    <a href="http://www.foobar.com/xxx" target="_blank">
<a href="http://www.danheller.com/xxx">
<a href="http://www.foobar.com/xxx" target="_blank">
<a href="http://www.danheller.com/xxx">