iphone app Form validation

Question

Hi how can I validate email address, username, fullname and date of birth for my registration form inside an iphone application.

Answer 1

You can use NSPredicate with regular expressions in iPhone OS > 3.0 like so

    - (BOOL) validateEmail: (NSString *) candidate {
       NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"; 
       NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex]; 

       return [emailTest evaluateWithObject:candidate];
    }