Some very old code implementing basic search split on words. Don't judge.

BasicCoreDataSearchImplementation.m

-(void)searchBar:(UISearchBar *)searchBar textDidChange:(NSString *)searchText {
    NSMutableSet *uniqueCharts = [NSMutableSet set];
    
    NSMutableCharacterSet *charSet = [[NSMutableCharacterSet alloc] init];
    
    [charSet formUnionWithCharacterSet:[NSCharacterSet punctuationCharacterSet]];
    [charSet formUnionWithCharacterSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    
    NSArray *words = [searchText componentsSeparatedByCharactersInSet:charSet];
    
    BOOL firstLoop = YES;
    for (NSString *aWord in words) {
        if (aWord.length < 3) {
            break;
        }
        
        NSPredicate *aPredicate = [NSPredicate prefixMatchingPredicateForString:aWord withKeyPath:@"word"];
        
        if (!aPredicate) {
            break;
        }
        
        NSArray *results = [self fetchChartsWithPredicate:aPredicate]; // returns a unique array of TncManagedCharts
        
        // on the first run, populate with the results. On subsequent runs, intersect the two
        if (firstLoop) {
            uniqueCharts = [NSMutableSet setWithArray:results];
            firstLoop = NO;
            
        } else {
            [uniqueCharts intersectSet:[NSSet setWithArray:results]];
            
        }
        
        
        if (IsEmpty(uniqueCharts)) {
            // if we have no results, we won't have any on subsequent loops either. So no need to search further
            self.searchArray = nil;
            return;
        }
    }
    
    [self resetSearchArrayFromUniqueCharts:uniqueCharts];
    
}

I think I actually meant continue above where I said break