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run code in 150+ php & hhvm versions
Bugs & Features
<?php $regex = '(?<!<br>)(?<!\s)\s*(\((?:(?:(?!<br>|\(|\)).)*(?:\((?:(?!<br>|\(|\)).)*\))?)*?\))\s*(\{)'; $test_string = 'AAAAAAAAAAAAAA{AA'; echo "1:".mb_ereg_replace($regex,'WORKED',$test_string)."\n"; echo "2:".preg_replace('/'.$regex.'/u','WORKED',$test_string)."\n"; echo "3:".preg_replace('/'.$regex.'/','WORKED',$test_string)."\n";
Output for 5.0.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
1:AAAAAAAAAAAAAA{AA 2:AAAAAAAAAAAAAA{AA 3:AAAAAAAAAAAAAA{AA
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.4 - 4.4.9
Warning: mb_ereg_replace(): mbregex compile err: undefined (?...) sequence in /in/UgmXc on line 4 1: 2:AAAAAAAAAAAAAA{AA 3:AAAAAAAAAAAAAA{AA
Output for 4.3.2 - 4.3.3
Fatal error: Call to undefined function: mb_ereg_replace() in /in/UgmXc 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/UgmXc on line 4