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<?php $regex = '((?!a).*)a\{'; $test_string = 'AAAAAAAAAAAAAA{AA'; echo "2:".preg_replace('/'.$regex.'/u','WORKED',$test_string)."\n"; echo "3:".preg_replace('/'.$regex.'/','WORKED',$test_string)."\n";

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28.52 ms | 402 KiB | 5 Q