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 $p="horraen=sumsel\[13\]\)\n";
 $m="sumsel\[13\]";

 $p="horraen=sumsel[13])\n";
 $m="sumsel[13]";

 $p="horraen=sumsel\\[13\\]\\)\n";
 $m="sumsel\\[13\\]";

 $p='horraen=sumsel\[13\]\)' . "\n";
 $m='sumsel\[13\]';

 $p="horraen=sumsel[13])\n";
 $m=qr/sumsel\[13\]/;