Allow some special character along with alphanumeric characters

Question

I have used php preg_replace function to allow only alphanumeric character from a variable string. The code is given below. This code works fine.

But now I want to allow some special characters like ~!@#$%^&*()_+/ etc along with alphanumeric characters. How to do this?

$hashh=$_GET['hash'];
$hash = preg_replace("/[^a-zA-Z0-9]+/", "", $hashh);

Answer 1

Try this

$regex = "/[^a-zA-Z0-9~!@#$%^&*()_+\/]+/";
$string = "Th3 4ll0w3d P4rt5 4r3 ~!@#$%^&*()_+/";
$preg = preg_replace($regex, '', $string);
echo $preg;