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run code in 200+ 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 - 5.6.30, hhvm-3.10.1 - 3.22.0, 7.0.0 - 7.2.1
Array ( [0] => Array ( [0] => def [1] => 0 ) )