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run code in 150+ php & hhvm versions
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<?php $regex = '(((?!a).)*)*a\\{'; $test_string = 'AAAAAAAAAAAAAA{AA'; echo "1:".var_dump(mb_ereg_replace($regex,'WORKED',$test_string))."\n"; echo "2:".var_dump(preg_replace('/'.$regex.'/u','WORKED',$test_string))."\n"; echo "3:".preg_replace('/'.$regex.'/','WORKED',$test_string)."\n";
Output for 4.3.4 - 4.4.5, 4.4.9 - 5.1.6, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(17) "AAAAAAAAAAAAAA{AA" 1: string(17) "AAAAAAAAAAAAAA{AA" 2: 3:AAAAAAAAAAAAAA{AA
Output for 5.2.0 - 5.2.1, 5.2.4 - 5.6.28
string(17) "AAAAAAAAAAAAAA{AA" 1: NULL 2: 3:
Output for 4.4.6 - 4.4.8, 5.2.2 - 5.2.3
string(17) "AAAAAAAAAAAAAA{AA" 1:
Process exited with code 139.
Output for 4.3.2 - 4.3.3
Fatal error: Call to undefined function: mb_ereg_replace() in /in/pkCVc on line 4
Process exited with code 255.
Output for 4.3.0 - 4.3.1
Fatal error: Call to undefined function: mb_ereg_replace() in /in/pkCVc on line 4