app
        .filter('iban', function() {
            return function(input) {
                
                if(!angular.isString(input) || input.length != 26) 
                {
                    return 'błędny IBAN';
                }
                
                return input.replace(/([0-9]{2})([0-9]{4})([0-9]{4})([0-9]{4})([0-9]{4})([0-9]{4})([0-9]{4})/,'$1 $2 $3 $4 $5 $6 $7');
            };
        });