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run code in 150+ php & hhvm versions
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<?php preg_match( '/^ndg_keywords.partial/', 'ndg_keywords.partial(\'a_Imelda Staunton \')', $matches); echo $matches[1]; // 1234 ?>
Output for 5.5.0 - 7.1.0
Notice: Undefined offset: 1 in /in/5aKJt on line 3
Output for 4.3.0 - 5.4.45