正则表达式（邮箱，密码，手机号，身份证）

//邮箱
- (BOOL) validateEmail:(NSString *)email
{

    NSString *emailRegex =
@"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
   
NSPredicate *emailTest = [NSPredicate
predicateWithFormat:@"SELF MATCHES %@", emailRegex];
   
return [emailTest
evaluateWithObject:email];
}

//手机号码验证
- (BOOL) validateMobile:(NSString *)mobile
{

    //手机号以13，14, 15，18开头，八个
\d 数字字符

    NSString *phoneRegex =
@"^((13[0-9])|(15[^4,\\D])|(18[0,0-9])|(14[0-9]))\\d{8}$";
   
NSPredicate *phoneTest = [NSPredicate
predicateWithFormat:@"SELF MATCHES %@",phoneRegex];
   
return [phoneTest
evaluateWithObject:mobile];
}

//密码
- (BOOL) validatePassword:(NSString *)passWord
{

//    NSString *passWordRegex = @"^[a-zA-Z0-9]{6,20}+$";
密码是数字或者字母

    NSString *passWordRegex =
@"^(?![0-9]+$)(?![a-zA-Z]+$)[0-9A-Za-z]{8,16}$";//密码是数字或者字母，且不能全部是数字，全部是字母
   
NSPredicate *passWordPredicate = [NSPredicate
predicateWithFormat:@"SELF MATCHES %@",passWordRegex];
   
return [passWordPredicate
evaluateWithObject:passWord];
}

//身份证号
- (BOOL) validateIdentityCard: (NSString *)identityCard
{
   
BOOL flag;
   
if (identityCard.length <=
0) {
        flag =
NO;
       
return flag;
    }

    NSString *regex2 =
@"^(\\d{14}|\\d{17})(\\d|[xX])$";
   
NSPredicate *identityCardPredicate = [NSPredicate
predicateWithFormat:@"SELF MATCHES %@",regex2];
   
return [identityCardPredicate
evaluateWithObject:identityCard];
}