Sure, but I was explaining algorithm for the OP and was deliberately avoiding that part of the discussion, because normally, one does not allow e.g. a left bracket without a right bracket before even letting the data through to the processing phase - that is a "syntax error" in my book. So in my example, if the flag is still turned on after the loop I would terminate with an error message, unless the OP specifically stated that an unterminated 6 is allowed, in which case I would save what isn't being pushed into a separate array and push it at the end if the flag is still turned on i.e.: 
use Data::Dumper;
my $allow_loose6 = 1;
my $aref = [1, 6, 2, 2, 7, 1, 6, 99, 99, 7];
my @new = ();
my @loose = ();
my $flag = 0;
for (@$aref) {
    $flag = 1 if (!$flag and $_==6);
    if (!$flag) {
    push @new, $_;
    }
    else {
        push @loose, $_;
    }
    if ($flag and $_==7) {
        $flag = 0;
    @loose = ();
    }
}
$aref = \@new;
if ($allow_loose6) {
    push @$aref, @loose;
}
elsif (@loose) {
    die "Unterminated 6 detected";
}
print Dumper $aref

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In reply to Re^3: Ignore a range of numbers ina List by anonymized user 468275
in thread Ignore a range of numbers ina List by pr33

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