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run code in 150+ php & hhvm versions
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<?php preg_match('/(\<!--\s*.*?((--\>)|$))/imsxn', '<!-- com1 <!-- com 2 <!-- com2.1 --> --> <!-- com3 --> -->', $matches);
Output for 4.3.11 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier 'n' in /in/9Ej5p on line 2
Output for hhvm-3.10.0 - 3.12.0
Warning: Unknown modifier 'n': [/(\<!--\s*.*?((--\>)|$))/imsxn] in /in/9Ej5p on line 2
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'n' in /in/9Ej5p on line 2