my $re = qr/^(?:Nov 29 [^\n]*\n)*\z/s;

print(/$re/ ? "pass\n" : "fail\n")
   for <<'__EOI__', <<'__EOI__';
Nov 29 16:01:27
Nov 29 16:01:28
Nov 29 16:01:28
Nov 29 16:01:28
Nov 30 16:01:22
__EOI__
Nov 29 16:01:27
Nov 29 16:01:28
Nov 29 16:01:28
Nov 29 16:01:28
__EOI__

##</code><code>##

fail
pass