How to validate email address in iPhone

Monday

iPhone SDK validate email address:
                                        This is prefect method to validate email address valid or not. In this method I'm using "NSPredicate" and "Name Regex" to validate email-ID

Code for email validation on textField in iPhone sdk:

NSString *email = textFieldemail.text;
NSString *emailRegEx =
@"(?:[a-z0-9!#$%\\&'*+/=?\\^_`{|}~-]+(?:\\.[a-z0-9!#$%\\&'*+/=?\\^_`{|}"
@"~-]+)*|\"(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21\\x23-\\x5b\\x5d-\\"
@"x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])*\")@(?:(?:[a-z0-9](?:[a-"
@"z0-9-]*[a-z0-9])?\\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\\[(?:(?:25[0-5"
@"]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-"
@"9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\\x01-\\x08\\x0b\\x0c\\x0e-\\x1f\\x21"
@"-\\x5a\\x53-\\x7f]|\\\\[\\x01-\\x09\\x0b\\x0c\\x0e-\\x7f])+)\\])";

NSPredicate *regExPredicate =
[NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegEx];
BOOL myStringMatchesRegEx = [regExPredicate evaluateWithObject:email];


if(!myStringMatchesRegEx)
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"email" message:@"invalid email-ID, please provide a valid email id." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}
else
[self prepareHmlDataAndSendEmail];

                     This is another one of  a simplest method to validate an email id on a text box in iphone development.

if (! (([txtMailId.text rangeOfString:@"@"].location != NSNotFound) && ([txtMailId.text rangeOfString:@"."].location != NSNotFound) && [txtMailId.text rangeOfString:@"@"].location < [txtMailId.text rangeOfString:@"."].location ) )
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"email" message:@"invalid email-ID, please enter a valid email id." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
[alert release];
}
else
[self prepareHmlDataAndSendEmail];