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  1. or download this
    <p>String AAA <b>varname</b> and string AAA and BBB</p>
  2. or download this
    my $sub = $elt->text();
$sub =~ s/AAA/ZZZ/g;
$elt->set_text($sub);
  3. or download this
    String ZZZ varname and string ZZZ and BBB