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run code in 150+ php & hhvm versions
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<?php preg_match( "/^ndg\_keywords\.partial\(\'([a-zA-Z0-9\_\ ]+)\'\)/", "ndg_keywords.partial('a_Imelda Staunton ')", $matches); echo $matches[1]; ?>
Output for 5.3.6 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
a_Imelda Staunton
Output for hhvm-3.10.0

Process exited with code 153.