常用的正则判断

@interface NSString (Predicate)

//有效的电话号码
- (BOOL) isValidMobileNumber;

//有效的真实姓名
- (BOOL) isValidRealName;

//是否只有中文
- (BOOL) isOnlyChinese;

//有效的验证码(根据自家的验证码位数进行修改)
- (BOOL) isValidVerifyCode;

//有效的银行卡号
- (BOOL) isValidBankCardNumber;

//有效的邮箱
- (BOOL) isValidEmail;

//有效的字母数字密码
- (BOOL) isValidAlphaNumberPassword;

//检测有效身份证
//15位
- (BOOL) isValidIdentifyFifteen;

//18位
- (BOOL) isValidIdentifyEighteen;

//限制只能输入数字
- (BOOL) isOnlyNumber;

@end

@implementation NSString (Predicate)
- (BOOL) isValidMobileNumber {
    NSString* const MOBILE = @"^1(3|4|5|7|8)\\d{9}$";
    
    NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
    return [predicate evaluateWithObject:self];
}

- (BOOL) isValidVerifyCode
{
    NSString *pattern = @"^[0-9]{4}";
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", pattern];
    return [predicate evaluateWithObject:self];
}

- (BOOL) isValidRealName

{
    NSString *nicknameRegex = @"^[\u4e00-\u9fa5]{2,8}$";
    
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",nicknameRegex];
    
    return [predicate evaluateWithObject:self];
}

- (BOOL) isOnlyChinese
{
    NSString * chineseTest=@"^[\u4e00-\u9fa5]{0,}$";
    NSPredicate*chinesePredicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",chineseTest];
    return [chinesePredicate evaluateWithObject:self];
}


- (BOOL) isValidBankCardNumber {
    NSString* const BANKCARD = @"^(\\d{16}|\\d{19})$";
    
    NSPredicate* predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", BANKCARD];
    return [predicate evaluateWithObject:self];
}


- (BOOL) isValidEmail
{
    
    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:self];
    
}
- (BOOL) validateNickName
{
    NSString *userNameRegex = @"^[A-Za-z0-9\u4e00-\u9fa5]{1,24}+$";
    
    NSPredicate *userNamePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",userNameRegex];
    
    return [userNamePredicate evaluateWithObject:self];
}
- (BOOL) isValidAlphaNumberPassword
{
    NSString *regex = @"^(?!\\d+$|[a-zA-Z]+$)\\w{6,12}$";
    NSPredicate *identityCardPredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];
    return [identityCardPredicate evaluateWithObject:self];
}


- (BOOL) isValidIdentifyFifteen
{
    NSString * identifyTest=@"^[1-9]\\d{7}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}$";
    NSPredicate*identifyPredicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",identifyTest];
    return [identifyPredicate evaluateWithObject:self];
}

- (BOOL) isValidIdentifyEighteen
{
    NSString * identifyTest=@"^[1-9]\\d{5}[1-9]\\d{3}((0\\d)|(1[0-2]))(([0|1|2]\\d)|3[0-1])\\d{3}([0-9]|X)$";
    NSPredicate*identifyPredicate=[NSPredicate predicateWithFormat:@"SELF MATCHES %@",identifyTest];
    return [identifyPredicate evaluateWithObject:self];
}


- (BOOL) isOnlyNumber
{
    BOOL res = YES;
    NSCharacterSet* tmpSet = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];
    int i = 0;
    while (i < self.length) {
        NSString * string = [self substringWithRange:NSMakeRange(i, 1)];
        NSRange range = [string rangeOfCharacterFromSet:tmpSet];
        if (range.length == 0) {
            res = NO;
            break;
        }
        i++;
    }
    
    return res;
}


@end