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run code in 150+ php & hhvm versions
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<?php $subject = "abcdef"; $pattern = '/^def/'; preg_match($pattern, substr($subject,3), $matches, PREG_OFFSET_CAPTURE); print_r($matches);
Output for 4.3.0 - 7.1.0
Array ( [0] => Array ( [0] => def [1] => 0 ) )