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sub get_content {
    my $n = shift;
...
    $content=~s{(?:^[\n\r]\s{4}|[\n\r]+\s{4})(.*)}{$1\n}gm;
    return $content;
}

sub get_content {
    my $n = shift;
...
    my ($indent) = ($_[0] =~ /^([ \t]+)/);
    $_[0] =~ s/^$indent//gm;
}