br-validations/src/cpf.js

A library of validations applicable to several Brazilian data like I.E., CNPJ, CPF and others

var CPF = {};

CPF.validate = function(cpf) {
	cpf = cpf.replace(/[^\d]+/g,'');
	var r = /^(0{11}|1{11}|2{11}|3{11}|4{11}|5{11}|6{11}|7{11}|8{11}|9{11})$/;
	if (!cpf || cpf.length !== 11 || r.test(cpf)) {
		return false;
	}
	function validateDigit(digit) {
		var add = 0;
		var init = digit - 9;
		for (var i = 0; i < 9; i ++) {
			add += parseInt(cpf.charAt(i + init)) * (i+1);
		}
		return (add%11)%10 === parseInt(cpf.charAt(digit));
	}
	return validateDigit(9) && validateDigit(10);
};