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  1. or download this
    my @tworows = split /[^\n]+\n[^[n]+\n/, $text;
  2. or download this
    s/((\w+).+\1.+\1.+)\n(.+)/something/
  3. or download this
    
1. 
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4. it looks like you're using a numeric == to compare ascii fields lik
+e $row1[0] == $row2[0] when col 0 contains things like 'PF'. Use eq f
+or these compares. You can't use == there.