ABAddressBookRef Filter through ABRecordRefs

Here's a way to filter some phone contacts:

        ABAddressBookRef addressBook = ABAddressBookCreateWithOptions(NULL, &error);

        CFArrayRef people = ABAddressBookCopyArrayOfAllPeople(addressBook);

        CFMutableArrayRef peopleMutable = CFArrayCreateMutable(kCFAllocatorDefault, 0, &kCFTypeArrayCallBacks);

        if (people) {

            NSInteger numberOfPersonsInAB=CFArrayGetCount(people);

            for (int i =0; i< numberOfPersonsInAB; i++) {

                ABRecordRef record = CFArrayGetValueAtIndex(people, i);

                NSString *note = (__bridge NSString *)(ABRecordCopyValue(record, kABPersonNoteProperty));

                if ( note != nil &&  ([note rangeOfString:@"hi"].location != NSNotFound)) {

                    CFArrayAppendValue(peopleMutable, record);

                }

            }

            CFRelease(people);

        }