<?php var_dump(preg_match('/^\d+$/', "123")); var_dump(preg_match('/^\d+$/', "123\n")); var_dump(preg_match('/^\d+$/', "\n123\n")); var_dump(preg_match('/^\d+$/D', "123")); var_dump(preg_match('/^\d+$/D', "123\n")); var_dump(preg_match('/^\d+$/D', "\n123\n"));
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