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  1. or download this
    my $n = 3;
my $newword = NEW;
...
one two
one two NEW
one two NEW four
  2. or download this
    s/((?:\w+\s+){$n_minus_one})(\w+)/$1$newword/;
  3. or download this
    s/((?:[\w'\-]+[^\w'\-]+){$n_minus_one})(\w+)/$1$newword/;