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  1. or download this
    >perl -wMstrict -MData::Dump -le
"my $s = 'AAA BBB CCC DDD AAA BBB';
...
]

["AAA", "BBB", "AAA", "BBB"]
  2. or download this
    >perl -wMstrict -MData::Dump -le
"use 5.010;
...
 dd \@matches
"
["AAA", "BBB", "AAA", "BBB"]