Swift (1.2) function to validate CNPJ

cnpj_validator.swift

// Returns true if the given cnpj is valid
func checkIfCNPJIsValid(cnpj: String) -> Bool {
	
	if(cnpj.isEmpty) {
		return true
	}

	// validates format, allowed ones: 38.041.242/0001-04, 38041242000104
	var formatRegex = NSRegularExpression(pattern: "^[0-9\\.\\-\\/]*[0-9]$", options: NSRegularExpressionOptions.CaseInsensitive, error: nil)
	
	if(formatRegex!.matchesInString(cnpj, options: nil, range:NSMakeRange(0, count(cnpj))).count == 0) {
		return false
	}
	
	// remove any character that is not a decimal digit
	var regex: NSRegularExpression = NSRegularExpression(pattern: "\\D", options: NSRegularExpressionOptions.CaseInsensitive, error: nil)!
	
	var cnpj = regex.stringByReplacingMatchesInString(cnpj, options: nil, range: NSMakeRange(0, count(cnpj)), withTemplate: "")
	
	if(cnpj == "") {
		return false
	}
	
	if (count(cnpj) != 14) {
		return false
	}
	
	// Elimina CNPJs invalidos conhecidos
	if (cnpj == "00000000000000" ||
		cnpj == "11111111111111" ||
		cnpj == "22222222222222" ||
		cnpj == "33333333333333" ||
		cnpj == "44444444444444" ||
		cnpj == "55555555555555" ||
		cnpj == "66666666666666" ||
		cnpj == "77777777777777" ||
		cnpj == "88888888888888" ||
		cnpj == "99999999999999") {
			return false
	}
	
	// Valida DVs
	var tamanho = count(cnpj) - 2
	var numeros = (cnpj as NSString).substringWithRange(NSRange(location: 0, length: tamanho))
	var digitos = (cnpj as NSString).substringWithRange(NSRange(location: count(cnpj)-2, length: 2))
	var soma = 0;
	var pos = tamanho - 7;
	
	for (var i = tamanho; i >= 1; --i) {
		var aux = String(Array(numeros)[tamanho-i]).toInt()! * pos--
		soma += aux
		
		
		if (pos < 2) {
			pos = 9
		}
	}
	
	var resultado = soma % 11 < 2 ? 0 : 11 - soma % 11;
	
	if ("\(resultado)" != (digitos as NSString).substringWithRange(NSRange(location: 0, length: 1))) {
		return false
	}
	
	tamanho = tamanho + 1;
	numeros = (cnpj as NSString).substringWithRange(NSRange(location: 0, length: tamanho))
	soma = 0;
	pos = tamanho - 7;
	
	for (var i = tamanho; i >= 1; --i) {
		var aux = String(Array(numeros)[tamanho-i]).toInt()! * pos--
		
		soma += aux
		
		if (pos < 2) {
			pos = 9
		}
	}
	
	resultado = soma % 11 < 2 ? 0 : 11 - soma % 11;
	
	if ("\(resultado)" != (digitos as NSString).substringWithRange(NSRange(location: 1, length: 1))) {
		return false
	}
	
	return true
}


validarCNPJ("54.425.507/0001-16")
// true