Instead of using a multine regex, you could consider looping over the lines in turn and removing every six lines where there's a match on the fourth.
I think the code is pretty self-explanatory (@lines contains your file):
my $i = 3; # from line 4 ...
while ($i < @lines - 2) { # ... until last but 3
if ($lines[$i] =~ m!<MYTAG></MYTAG>!) {
splice(@lines, $i - 3, 6); # kill 6 lines from $i - 3
} else {
$i++;
}
}
— Arien
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