正则表达式验证日期

- (BOOL)isdate

{

    NSString *date = @"2014-10-01";

    //验证年月日

    NSString *regex = @"((\\d{2}(([02468][048])|([13579][26]))[\\-]((((0?[13578])|(1[02]))[\\-]((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-]((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-]((0?[1-9])|([1-2][0-9])))))|(\\d{2}(([02468][1235679])|([13579][01345789]))[\\-]((((0?[13578])|(1[02]))[\\-]((0?[1-9])|([1-2][0-9])|(3[01])))|(((0?[469])|(11))[\\-]((0?[1-9])|([1-2][0-9])|(30)))|(0?2[\\-]((0?[1-9])|(1[0-9])|(2[0-8]))))))";

    NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];

    return [pred evaluateWithObject:date];

}