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run code in 150+ php & hhvm versions
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<?php $range = "2008-2013"; $year = "2008"; $regex = "/^((\d{0,4})+(?:-\d{0,4}+)?)$/is"; $matches = array(array()); preg_match($regex, $range, $matches[0]); preg_match($regex, $year, $matches[1]); print_r($matches); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Array ( [0] => Array ( [0] => 2008-2013 [1] => 2008-2013 [2] => ) [1] => Array ( [0] => 2008 [1] => 2008 [2] => ) )