Email id validation
<p>I have made an iphone application in which I have used email id validation. The code which I have used is as below:</p>

<pre><code>NSString *valid = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+.[A-Za-z]{2,4}"; 
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", valid];

if ([emailTest evaluateWithObject:Id.text] == NO) 
    {
        UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Validation" message:@"Email Id is not Valid" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
        [alert show];
        [alert release];

    }
    if ([emailTest evaluateWithObject:Id.text] == YES) 
    {
    NSString *b = Id.text; 
    NSLog(@"value of the Id is : %@",b);

        if([b length] != 0)
        {
            MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init];
            picker.mailComposeDelegate = self;

            //[picker setSubject:@"Your iPhone fan"];//@"Hello iPhone!"
            [picker setToRecipients:[NSArray arrayWithObject:b]];

            NSString *emailBody =@""; //@"";//@"Nice  to See you!";
            [picker setMessageBody:emailBody isHTML:NO];

            [self presentModalViewController:picker animated:YES];
            [picker release];

        }
    }
</code></pre>

<p>But if I put 1@gmail.com in textfield then it still shows valid id but in real it is invalid email id. </p>
