$_ = "X1aaX2bbX3heeX4...X5loveU" ;
@match = /X\d.+?/g;

print "String: " . $_;
foreach $word (@match){
    print "\n$word";
}

##</code><code>##

X1aaX2bbX3heeX4...X5loveU
X1a
X2b
X3h
X4.
X5l

##</code><code>##

X1aaX2bbX3heeX4...X5loveU
X1aa
X2bb
X3hee
X4...
X5loveU