正则表达式仅允许字母数字和其他特定字符

Question

With a PHP function I'm trying to create a RegEx string for preg_replace that will only allow alphanumeric characters plus ! @ # $ % & . , ! @ # $ % & . ,

The PHP function is

 function clean($var) {
    $regEx="REGEXSTRING";   
    $var = preg_replace($regEx, "", $var);
    return str_replace(array("&", "'"),
    array("&", "'"), $var);
}

What would the string be to match what I'm looking for.

:: EDIT :: As I was typing this I figured out what would work for me. Not sure if it is the best solution but it works. But I figured I'd post it here as a solution for other beginners.

The string I used is...

$regEx="/[^a-zA-Z0-9 !@#$%&.,]/";

Hope it helps someone.

Answer 1

 function clean($var) {
    $regEx="/[^a-zA-Z0-9 !@#$%&.,]/"; 
    $var = preg_replace($regEx, "", $var);
    return str_replace(array("&", "'"),
    array("&", "'"), $var);
}