如何读取特定格式的文本文件c ++

Question

我正在逐字阅读文件，我想首先通过将所有字符转换为小写来预处理单词并删除除标点符号 marks:hyphen (-) 和撇号 ( ') 然后相应地显示。我已完成将单词转换为 lowercase，但现在我需要删除除连字符 (-) 和撇号 (') 之外的非字母字符。我不知道该怎么做。有人可以解决这个问题吗？

void WordStats::ReadTxtFile()
{
    std::ifstream ifile(Filename);
    if(!ifile)
    {
        std::cerr << "Error Opening file " << Filename << std::endl;
        exit(1);
    }

    for (std::string word; ifile >> word; )
    {
        transform (word.begin(), word.end(), word.begin(), ::tolower);
        WordMap & Words = (Dictionary.count(word) ? KnownWords : 
        UnknownWords);
        Words[word].push_back(ifile.tellg()); 
    }

    std::cout << KnownWords.size() << " known words read." << std::endl;
    std::cout << UnknownWords.size() << " unknown words read." << std::endl;
}

Answer 1

你可以使用 std::remove_if

word.erase(std::remove_if(word.begin(), word.end(), [](char c)
{
    return (c < 'a' || c > 'z') && c != '\'' && c != '-';
}),  word.end());

如何读取特定格式的文本文件c ++

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