• 字符串提取
• 字符串筛选
• 字符串匹配 ```cpp

  include

  include

  include

  using namespace std;

//legal word dictionary string dictionary = “xX0123456789abcdefABCDEF”;

bool judge_indictionary(string input_str) { for (int i = 0; i < input_str.size(); i++) { if (dictionary.find(input_str[i]) == -1) { return false; } } return true; }

int main() { string key_word; while (cin >> key_word) { string temp; vector vec_word; vector vec_addr; vector vec_mask; vector vec_val;

    int index_f = 0;
    int index_b = 0;
    while (cin >> temp)
    {
        //pick usefull information
        index_f = 0;
        index_b = temp.find_first_of('[');
        vec_word.push_back(temp.substr(0, index_b));
        index_f = temp.find_first_of('=');
        index_b = temp.find_first_of(',');
        vec_addr.push_back(temp.substr(index_f + 1, (index_b - index_f - 1)));
        temp.erase(index_f, (index_b - index_f + 1));
        index_f = temp.find_first_of('=');
        index_b = temp.find_first_of(',');
        vec_mask.push_back(temp.substr(index_f + 1, (index_b - index_f - 1)));
        temp.erase(index_f, (index_b - index_f + 1));
        index_f = temp.find_first_of('=');
        index_b = temp.find_first_of(']');
        vec_val.push_back(temp.substr(index_f + 1, (index_b - index_f - 1)));
    }
    //the flag of having a result or not
    int flag = 0;
    for (int i = 0; i < vec_word.size(); i++)
    {
        if (vec_word[i] == key_word 
            &&(vec_addr[i].substr(0,2)=="0x"|| vec_addr[i].substr(0, 2) == "0X")
            &&(vec_mask[i].substr(0, 2) == "0x" || vec_mask[i].substr(0, 2) == "0X")
            &&(vec_val[i].substr(0, 2) == "0x" || vec_val[i].substr(0, 2) == "0X")
            && judge_indictionary(vec_addr[i])
            && judge_indictionary(vec_mask[i])
            && judge_indictionary(vec_val[i]))
        {
            flag = 1;
            cout << vec_addr[i];
            cout << " ";
            cout << vec_mask[i];
            cout << " ";
            cout << vec_val[i];
            cout << endl;
        }
    }
    //if doesn't find right information
    if (flag==0)
        cout << "FAIL" << endl;
}

} ```