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run code in 150+ php & hhvm versions
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<?php $subject = "Helló"; $pattern = '/ló/'; preg_match($pattern, substr($subject,3), $matches, PREG_OFFSET_CAPTURE); var_dump($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
array(1) { [0]=> array(2) { [0]=> string(3) "ló" [1]=> int(0) } }
Output for hhvm-3.10.0

Process exited with code 153.