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  1. or download this
       %{^MATCH_OFFSETS}
  2. or download this
        "abc" =~ /(?<l>[a-z])(?<l>[a-z])(?<l>[a-z])/
  3. or download this
        %{^MATCH_OFFSETS} = ('l'  =>  [[0, 1], [1, 2], [2. 3]]);