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run code in 150+ php & hhvm versions
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<?php preg_match('/(_[\w]{1})/g', "resource_id_heeelp_lala_klopsiki", $matches); print_r($matches);
Output for 5.2.0 - 5.6.28, 7.0.0 - 7.1.0
Warning: preg_match(): Unknown modifier 'g' in /in/1QJeE on line 2
Output for hhvm-3.12.0
Warning: Unknown modifier 'g': [/(_[\w]{1})/g] in /in/1QJeE on line 2
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.11 - 5.1.6
Warning: preg_match(): Unknown modifier 'g' in /in/1QJeE on line 2 Array ( )
Output for 4.3.0 - 4.3.10
Warning: Unknown modifier 'g' in /in/1QJeE on line 2 Array ( )