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  1. or download this
    bl123 and barthis123thatqux and barso123quxhim and123som 123
  2. or download this
    $str =~  s/((?<!bar)\S*)foo((?!\S*qux))/${1}123${2}/gx;
  3. or download this
    bl123 and barthisfoothatqux and barsofooquxhim and123som 123