Hmm, you do not want to use some simple things, for example:
$str = substr($lorem, strpos($lorem, 'Nulla'));
if you do not want to search for Nulla, but also for "null", you can use stripos instead of strpos ... This code will include Nulla in the return value. If you want to exclude Nulla, you can add lentgh to the strpos value
Honestly, regexp are redundant for something like this ...
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