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iosobjective-ciphoneemail-validation
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Reputation: 108

Domain Name email Validation

I am developing an iPhone application where I need the user to give his email address at login.

What is the best way to check if an email address is a domain name valid or not?

Upvotes: 0

Views: 7511

Answers (4)

Fahri Azimov
Fahri Azimov

Reputation: 11770

As @trojanfoe suggested, using MX record lookup you can check whether entered domain is a mail server. Here is an objective c version of MX record lookup, you need to initialize DNSServiceRef with kDNSServiceType_MX service type.

Another, the most reliable option to check whether user provided valid e-mail address or not would be sending e-mail with confirmation code to the entered e-mail address.

Good luck!

Upvotes: 0

Fahim Parkar
Fahim Parkar

Reputation: 31627

Below is what I use for email validation.

NSString *emailRegex = @"^[_A-Za-z0-9-\\+]+(\\.[_A-Za-z0-9-]+)*@[A-Za-z0-9-]+(\\.[A-Za-z0-9]+)*(\\.[A-Za-z]{2,})$";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];

if (![emailTest evaluateWithObject:emailTF.text]) {
    // wrong email
} else {
    // right email...
}

Edit 1

If you want to check for domain, go with below.

NSPredicate *websitePredicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",@"^[A-Za-z0-9]+(.[A-Za-z0-9-:;\?#_]+)+"];
if ([websitePredicate evaluateWithObject:@"google.com"]) {
    NSLog(@"valid domain");
} else {
    NSLog(@"not valid domain");
}

I hope you are looking for this...

Edit 2

If you are looking for actual validation of domain name (& not format of domain), then you should follow @trojanfoe answer

Upvotes: 1

Er.Shreyansh Shah
Er.Shreyansh Shah

Reputation: 1482

To check email address :-

NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
    NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
    if( [emailTest evaluateWithObject:email]){
//Valid email
}else{
//Wrong Email id 
}

We can check domain name but we can't say that this is valid or not because domain name is not fixed ex:- 1)[email protected]

2) [email protected]

3) [email protected]

4) [email protected]

We can check specific domain name as email address contains "gmail.com" or "yahoo.com"

It's not fix because domain name format is not fix.

It might be like :-

1) [email protected]

2) [email protected]

3) [email protected]

4) [email protected]

Upvotes: 2

trojanfoe
trojanfoe

Reputation: 122381

If it's really important to you then you could attempt to look-up the MX record of the domain specified, via DNS.

See this answer for (Linux) C code to do that.

Upvotes: 3

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