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  1. or download this
    s/^(.{6,}?)\s+\z/$1/s;
s/^\s*(.{6}).*\z/$1/s;
  2. or download this
    s/(?<=.{6})\s+\z//s;
  3. or download this
    s/.{6}\K\s+\z//s;     # Req 5.10
  4. or download this
    s/^\s+(?=.{6})//s;
s/(?<=^.{6}).*\z//s;
  5. or download this
    s/^\s+(?=.{6})//s;
s/(?<=.{6}).*\z//s;
  6. or download this
    s/^\s+(?=.{6})//s;
s/^.{6}\K.*\z//s;     # Req 5.10