NSAttributedStringを検索して特定文字列に色を付ける方法

-(void) attributeStrings{
    NSString* plainStr = [zNSAttributedStringObj string];
    NSString* searchWord = @"\n    *";
    NSRange range = NSMakeRange(0,[plainStr length]);
    NSRange target;

    while ( target.location != NSNotFound ) {
        target = [plainStr rangeOfString:searchWord options:NSLiteralSearch range:range];
        NSDictionary *stringAttributes3 = @{ NSForegroundColorAttributeName : [NSColor blueColor]};
   
        if (target.location != NSNotFound) {
            [zNSAttributedStringObj setAttributes:stringAttributes3 range:target];
            NSInteger from = range.location + [searchWord length];
            NSInteger end = [plainStr length] - from;
            range = NSMakeRange(from, end);
        }
    }

}
//searchWordをNsRegularExpressionとNSDictionaryのNSArrayにでもすれば、まとめて色付けできるかな？
//いまのところ実行速度は期待していない。。。