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<?php preg_match("/(\w+\-)?/", "dsgfcdfsg\-sf",$matches); print_r($matches); echo "\n"; preg_match("/(\w*)/", "dsgfcdfsg-sf",$matches); print_r($matches);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
Array ( [0] => ) Array ( [0] => dsgfcdfsg [1] => dsgfcdfsg )