iOS: Validate valid Mail.

gistfile1.m

-(BOOL) NSStringIsValidEmail:(NSString *)checkString {
   BOOL stricterFilter = YES; // Discussion http://blog.logichigh.com/2010/09/02/validating-an-e-mail-address/
   NSString *stricterFilterString = @"[A-Z0-9a-z\\._%+-]+@([A-Za-z0-9-]+\\.)+[A-Za-z]{2,4}";
   NSString *laxString = @".+@([A-Za-z0-9]+\\.)+[A-Za-z]{2}[A-Za-z]*";
   NSString *emailRegex = stricterFilter ? stricterFilterString : laxString;
   NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
   return [emailTest evaluateWithObject:checkString];
}

// Others

- (BOOL) emailValidation: (NSString *) emailToValidate {
   NSString *regexForEmailAddress = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
   NSPredicate *emailValidation = [NSPredicate predicateWithFormat:@"SELF MATCHES %@",regexForEmailAddress];
   return [emailValidation evaluateWithObject:emailToValidate];
}