判断邮箱是否合法

最新推荐文章于 2022-12-22 17:07:12 发布

bidianzhang

最新推荐文章于 2022-12-22 17:07:12 发布

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分类专栏： iOS 文章标签： string email

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-(BOOL)validateEmail:(NSString*)email
{
    if((0 != [email rangeOfString:@"@"].length) &&
       (0 != [email rangeOfString:@"."].length))
    {
 
        NSCharacterSet* tmpInvalidCharSet = [[NSCharacterSet alphanumericCharacterSet] invertedSet];//可以判断一个NSString字符串里面是否只含有 a-z 0-9字符
        NSMutableCharacterSet* tmpInvalidMutableCharSet = [[tmpInvalidCharSet mutableCopy] autorelease];//mutableCopy是深拷贝，即对象拷贝，可以改变对象的内容

[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;}

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