PHP 正则表达式、反则替换字符串

代码：

 

  //反则，保留除了A-Za-z0-9@\*的字符
    $word = "6915-615@JPY11890*5822 " ;
    $par = array('/[^A-Za-z0-9@\*]/'); 
    $word = preg_replace($par, "", $word);
    echo     $word;
    echo "<br>";

    //正则，剔除A-Za-z0-9@\*字符
    $word = "6915-615@JPY11890*5822 " ;
    $par = array('/[A-Za-z0-9@\*]/'); 
    $word = preg_replace($par, "", $word);
    echo     $word;

结果：

 

6915615@JPY11890*5822
-