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run code in 150+ php & hhvm versions
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<?php preg_match( "/^ndg\_keywords\.partial\('[a-zA-Z_\ ]+'\)/", "ndg_keywords.partial('a_Imelda Staunton ')", $matches); echo $matches[1]; // 1234 ?>
Output for 5.3.0 - 5.6.28, 7.0.0 - 7.1.0
Notice: Undefined offset: 1 in /in/tb08L on line 3
Output for hhvm-3.10.0 - 3.13.2
Notice: Undefined index: 1 in /in/tb08L on line 3
Output for 4.3.0 - 5.2.17
Notice: Undefined offset: 1 in /in/tb08L on line 3