iPhone开发判断邮箱格式是否合法

来源：互联网发布：单片机hex文件编辑：程序博客网时间：2024/04/24 12:34

记录一下如何在iOS开发中判断邮箱格式的合法性，看了论坛里的favormm博客使用的方法，还有以下通过字符串操作来检查邮箱合法性（原址貌似打不开了）:

-(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;

}

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 // no ''@'' or ''.'' present

return NO;

}

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

    if( (0 != [email rangeOfString:@"@"].length) && (0 != [email rangeOfString:@"."].length) )
    {
        NSMutableCharacterSet *invalidCharSet = [[[[NSCharacterSet alphanumericCharacterSet] invertedSet]mutableCopy]autorelease];
        [invalidCharSet removeCharactersInString:@"_-"];

        NSRange range1 = [email rangeOfString:@"@" options:NSCaseInsensitiveSearch];

        // If username part contains any character other than "." "_" "-"

        NSString *usernamePart = [email substringToIndex:range1.location];
        NSArray *stringsArray1 = [usernamePart componentsSeparatedByString:@"."];
        for (NSString *string in stringsArray1) {
            NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet: invalidCharSet];
            if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])
                return NO;
        }

        NSString *domainPart = [email substringFromIndex:range1.location+1];
        NSArray *stringsArray2 = [domainPart componentsSeparatedByString:@"."];

        for (NSString *string in stringsArray2) {
            NSRange rangeOfInavlidChars=[string rangeOfCharacterFromSet:invalidCharSet];
            if(rangeOfInavlidChars.length !=0 || [string isEqualToString:@""])
                return NO;
        }

        return YES;
    }
    else // no ''@'' or ''.'' present
        return NO;
}

最后使用了以下这段代码：

判断输入的String是否Email的正则表达

+ (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];
}

PS：NSPredicate这里起筛选的作用，判断邮箱格式合法性