Online PHP editor | output for R6nod

<?php $_POST['input'] = 'aA1'; if (preg_match('/(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; if (preg_match('/[a-zA-Z0-9]/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; if (preg_match('/^[a-zA-Z0-9]+$/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; $_POST['input'] = 'a1'; if (preg_match('/(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; if (preg_match('/[a-zA-Z0-9]/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; if (preg_match('/^[a-zA-Z0-9]+$/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; $_POST['input'] = 'a#1'; if (preg_match('/(?=.*[A-Z])(?=.*[a-z])(?=.*[0-9])/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; if (preg_match('/[a-zA-Z0-9]/', $_POST['input'])) echo "ok\n"; else echo "not ok\n"; if (preg_match('/^[a-zA-Z0-9]+$/', $_POST['input'])) echo "ok\n"; else echo "not ok\n";