Strong Password Validation Function

[Zyphering]

Does anyone has a strong password validation function that I can use.

 

The code below will validate 1 uppercase 1 lowercase 1 digit.

I also want it to validate 1 symbol.

How can that be done?

I am not good with regular expressions. 

 

// Password must be strong
if(preg_match("/^.*(?=.{8,})(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z]).*$/", $_POST["pass"]) === 0)
$errPass = '<p class="errText">Password must be at least 8 characters and must contain at least one lower case letter, one upper case letter and one digit</p>';
}