eMail Validation in iOS sdk

NSString *email = @"examle@example.com";

    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:@"Email id is invalid, please provide a valid email id." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];

        [alert show];

        [alert release];

    }

    else

        NSLog(@"Valid eMail address");