Here is my proposal which has a somewhat simpler logic utilizing the empty string to print nothing:
use strict;
use warnings;
my $previous="";
while(<DATA>){
if(/XXXXX/){
<DATA>;
$previous="";
}else{
print $previous;
$previous=$_;
}
}
print $previous;
__DATA__
PPPPP
XXXXX is my name
YYYYY
KKKKK
UUUUU
BBBBB
CCCCCC
XXXXX is what I play
KKKKK
NNNNN
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