NSString+Range.m

@implementation NSString (Range)

- (NSArray *)rangesOfString:(NSString *)substring {

    if (self.length == 0 || substring.length == 0)
        return @[];

    NSRange searchRange = NSMakeRange(0, self.length - 1);
    NSMutableArray *ranges = [@[] mutableCopy];
    while (searchRange.location < self.length) {
        searchRange.length = self.length - searchRange.location;
        NSRange findRange = [self rangeOfString:substring options:NSCaseInsensitiveSearch range:searchRange];

        if (findRange.length != 0)
            [ranges addObject:NSStringFromRange(findRange)];

        if (findRange.location != NSNotFound) {
            searchRange.location = findRange.location + findRange.length;
        }else {
            break;
        }
    }

    return [ranges copy];
}

@end