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  1. or download this
      $words_to_match =~ s/^\s*|\s+|\s*$/\\s*/g;
  $output_line =~ /$words_to_match/i;
  ...
  2. or download this
      $words_to_match =~ s/^\s*|\s*$/\\s*/g;
  $words_to_match =~ s/\s+/\\s+/g;
  $output_line =~ /$words_to_match/i;
  ...