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  1. or download this
    m/^(?! $a ) .*?  $end/sx
  2. or download this
    m/^(?! .*? $a ) .*? $end/sx
  3. or download this
    $_ = '...</code> ... foo';

...
    print "Match\n";
}
# no match
  4. or download this
    m/^ (?: . (?! $a ) )* $end /sx
  5. or download this
    $_ = 'foo...</code> ... ';

...
    print "Match\n";
}
# match
  6. or download this
    m/^ (?: (?! $a ) . )* $end /sx