Question

我有下面的代码：

class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder>   {
private ArrayList<Webtoon> mWebtoon;
private Context context;
RecyclerView mRecyclerView;
RecyclerView.Adapter mAdapter;
private ArrayList<Webtoon> mWebtoons;
String[] imageUrl = {"https://shared-comic.pstatic.net/thumb/webtoon/183559/thumbnail/title_thumbnail_20160516123017_t218x120.jpg",
        "https://shared-comic.pstatic.net/thumb/webtoon/183559/thumbnail/title_thumbnail_20160516123017_t218x120.jpg",
        "https://shared-comic.pstatic.net/thumb/webtoon/557672/thumbnail/title_thumbnail_20150323145400_t220x202.jpg"};
public MainAdapter(ArrayList<Webtoon> webtoons) {
    mWebtoons = webtoons;
}

@Override
public MainAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);
    return new ViewHolder(view);
}


@Override
public void onBindViewHolder(MainAdapter.ViewHolder holder, int position) {

    String title1 =(mWebtoons.get(position).getmUrl().replaceAll(":: 네이버 만화", ""));
    String title2 = title1.replaceAll(":: 네이버 웹툰", "");
    holder.mTitleTextView.setText(title2);


   for (int i = 0; i < imageUrl.length; i++) {


        Picasso.get().load
                (imageUrl[i]).resize(500,400)
                .into(holder.webtoonCoverImage);

    }


}

@Override
public int getItemCount() {
    return mWebtoons.size();
}

public class ViewHolder extends RecyclerView.ViewHolder {

    public TextView mTitleTextView;
    public ImageView webtoonCoverImage;

    public ViewHolder(View itemView) {
        super(itemView);

        mTitleTextView = (TextView) itemView.findViewById(R.id.title_text_view);
        webtoonCoverImage = itemView.findViewById(R.id.webtoon_cover_image);

    }
}

输出：r1：1 r2：0 r3：1 r4：1

我不明白为什么r2不匹配？

我的环境是：

使用以下命令配置--prefix = / Applications / Xcode.app / Contents / Developer / usr --with-gxx-include-dir = / usr / include / c ++ / 4.2.1 Apple LLVM版本10.0.0（clang-1000.11.45.5）目标：x86_64-apple-darwin17.7.0 螺纹型号：posix InstalledDir：/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin。

Answer 1

c正则表达式风味为POSIX ERE acc。到clang-format regex syntax reference。在POSIX bracket expressions中，不支持常规的正则表达式转义序列，例如\s，\d，\w甚至\]。

[\s\S]与[\\sS]相同，并匹配反斜杠s和S字符。

但是，在POSIX正则表达式标准中，.与任何个字符匹配，包括换行符，因此无需使用[\s\S]解决方法。

为什么“ [\\ s \\ S]”在C ++ 11的正则表达式中不起作用

1 个答案: