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  1. or download this
    >perl -wMstrict -le
    "my $dna = 'xxpecbcbccrlxxxPeeeerlxxpLxxxPeRLxx';
    ...
     printf qq{'$_' } for @matches;
    "
    'pecbcbccrl' 'Peeeerl' 'pL' 'PeRL'