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Regular expression for ios

-(BOOL)textField:(UITextField*)textField shouldChangeCharactersInRange:(NSRange)r replacementString:(NSString*)s

{

  NSCharacterSet * reject = [[NSCharacterSet characterSetWithCharactersInString:@"QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm1234567890-&"] invertedSet];

  if ([s rangeOfCharacterFromSet:reject].length)

  {

    return NO;

  }

  return YES;

}

       

NSMutableCharacterSet *legalCharacters = [NSCharacterSet alphanumericCharacterSet];

[legalCharacters addCharactersInString:@"-&"];

NSCharacterSet *illegalCharacters = [legalCharacters invertedSet];

 

NSString *testString = @"ThisStringWillFail@#$%";

 

if ([testString rangeOfCharacterFromSet:illegalCharacters].location == NSNotFound) {

    // string passed validation

} else {

    // string failed validation

}