验证邮箱合法性

[ios]代码库

-(BOOL)validateEmail:(NSString*)email

{

    if((0 != [email rangeOfString:@"@"].length) &&

       (0 != [email rangeOfString:@"."].length))

    {

        NSCharacterSet* tmpInvalidCharSet = [[NSCharacterSet alphanumericCharacterSet] invertedSet];
        NSMutableCharacterSet* tmpInvalidMutableCharSet = [[tmpInvalidCharSet mutableCopy] autorelease];

        [tmpInvalidMutableCharSet removeCharactersInString:@"_-"];

        
        /*

         *使用compare option 来设定比较规则，如

         *NSCaseInsensitiveSearch是不区分大小写

         *NSLiteralSearch 进行完全比较,区分大小写

         *NSNumericSearch 只比较定符串的个数，而不比较字符串的字面值

         */

        NSRange range1 = [email rangeOfString:@"@"

                                      options:NSCaseInsensitiveSearch];

        
        //取得用户名部分

        NSString* userNameString = [email substringToIndex:range1.location];

        NSArray* userNameArray   = [userNameString componentsSeparatedByString:@"."];

        
        for(NSString* string in userNameArray)

        {

            NSRange rangeOfInavlidChars = [string rangeOfCharacterFromSet: tmpInvalidMutableCharSet];

            if(rangeOfInavlidChars.length != 0 || [string isEqualToString:@""])

                return NO;

        }

        
        //取得域名部分

        NSString *domainString = [email substringFromIndex:range1.location+1];

        NSArray *domainArray   = [domainString componentsSeparatedByString:@"."];

        
        for(NSString *string in domainArray)

        {

            NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:tmpInvalidMutableCharSet];

            if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])

                return NO;

        }

        
        return YES;

    }

    else {

       return NO;

    }

}



//利用正则表达式验证
-(BOOL)isValidateEmail:(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];

}