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  1. or download this
    $_ = "X1aaX2bbX3heeX4...X5loveU" ;
@match = /X\d.+?/g;
...
foreach $word (@match){
    print "\n$word";
}
  2. or download this
    X1aaX2bbX3heeX4...X5loveU
X1a
...
X3h
X4.
X5l
  3. or download this
    X1aaX2bbX3heeX4...X5loveU
X1aa
...
X3hee
X4...
X5loveU