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  1. or download this
    s/(.*ing)(?:(?!bob|fred|bill).)*(more)/\1HIT\2/;
  2. or download this
    s/
   (.*ing)
...
   )
   (more)
/\1HIT\2/x;
  3. or download this
    my %bad_words = map { $_ => 1 } qw( bob fred bill );

...
   (?(?{ $bad_words{$2} })\A(?!\A))
   (more)
/\1HIT\3/x;
  4. or download this
    s/(.*ing)(?!bob|fred|bill).*(more)/\1HIT\2/;