CPF jquery validate required not true

gistfile1.txt

jQuery.validator.addMethod("verificaCPF", function(value, element) {

	    value = value.replace('.','');

	    value = value.replace('.','');

	    cpf = value.replace('-','');

	    while(cpf.length < 11) cpf = "0"+ cpf;

	    var expReg = /^0+$|^1+$|^2+$|^3+$|^4+$|^5+$|^6+$|^7+$|^8+$|^9+$/;

	    var a = [];

	    var b = new Number;

	    var c = 11;

	    for (i=0; i<11; i++){

	        a[i] = cpf.charAt(i);

	        if (i < 9) b += (a[i] * --c);

	    }

	    if ((x = b % 11) < 2) { a[9] = 0 } else { a[9] = 11-x }

	    b = 0;

	    c = 11;

	    for (y=0; y<10; y++) b += (a[y] * c--);

	    if ((x = b % 11) < 2) { a[10] = 0; } else { a[10] = 11-x; }

	    if ((cpf.charAt(9) != a[9]) || (cpf.charAt(10) != a[10]) || cpf.match(expReg)) return false;

	    return true;

}); // Mensagem padrão

CPF: {
	verificaCPF: { //função que verifica o cpf no jquery validade
		depends: function () {
			if($('#CPF').val()!=''){
				return true;
				}else{
				return false;
				}
				//return $("#CPF").val()!='';
				}
			}
				//verificaCPF: true
	},