Regex for checking that at least 3 of 4 different character groups exist

Question

I\'m trying to write a password validator.

How can I see if my supplied string contains at least 3 different character groups?

It\'s easy enough to check if

Answer 1

May as well join in on the fun:

String.prototype.isValidPW = function(){   
    // First, check for at least 8 characters
    if (this.length < 8) return false;

    // next, check that we have at least 3 matches
    var re = [/\d/, /[A-Z]/, /[a-z]/, /[!@#$%&\/=?_.,:;-]/], m = 0;
    for (var r = 0; r < re.length; r++){
        if ((this.match(re[r]) || []).length > 0) m++;
    }

    return m >= 3;
};

if ("P@ssW0rd".isValidPW()) alert('Acceptable!');

Demo