C++按行分割字符串

Question

我需要按行分割字符串。 我用下面的方法做：“我们是一个\ nyes我们是”

int doSegment(char *sentence, int segNum) 
{ 
assert(pSegmenter != NULL); 
Logger &log = Logger::getLogger(); 
char delims[] = "\n"; 
char *line = NULL; 
if (sentence != NULL) 
{ 
    line = strtok(sentence, delims); 
    while(line != NULL) 
    { 
     cout << line << endl; 
     line = strtok(NULL, delims); 
    } 
} 
else 
{ 
    log.error("...."); 
} 
return 0; 
} 

我输入并调用doSegment方法。但是当我调试时，我发现句子参数是“我们是一个。\ \ n我们是”，并且分裂失败了。有人可以告诉我为什么发生这种情况，我该怎么做。无论如何，我还可以用C++分割字符串。谢谢 ！

Answer 1

我想使用std :: getline或std :: string :: find来检查字符串。 下面的代码演示getline函数的

int doSegment(char *sentence) 
{ 
    std::stringstream ss(sentence); 
    std::string to; 

    if (sentence != NULL) 
    { 
    while(std::getline(ss,to,'\n')){ 
     cout << to <<endl; 
    } 
    } 

return 0; 
} 

Answer 2

您可以在循环中调用std::string::find并使用std::string::substr。

std::vector<std::string> split_string(const std::string& str, 
             const std::string& delimiter) 
{ 
    std::vector<std::string> strings; 

    std::string::size_type pos = 0; 
    std::string::size_type prev = 0; 
    while ((pos = str.find(delimiter, prev)) != std::string::npos) 
    { 
     strings.push_back(str.substr(prev, pos - prev)); 
     prev = pos + 1; 
    } 

    // To get the last substring (or only, if delimiter is not found) 
    strings.push_back(str.substr(prev)); 

    return strings; 
} 

查看示例here。

Answer 3

#include <iostream> 
#include <string> 
#include <regex> 
#include <algorithm> 
#include <iterator> 

using namespace std; 


vector<string> splitter(string in_pattern, string& content){ 
    vector<string> split_content; 

    regex pattern(in_pattern); 
    copy(sregex_token_iterator(content.begin(), content.end(), pattern, -1), 
    sregex_token_iterator(),back_inserter(split_content)); 
    return split_content; 
} 

int main() 
{ 

    string sentence = "This is the first line\n"; 
    sentence += "This is the second line\n"; 
    sentence += "This is the third line\n"; 

    vector<string> lines = splitter(R"(\n)", sentence); 

    for (string line: lines){cout << line << endl;} 

} 

// 1) We have a string with multiple lines 
// 2) we split those into an array (vector) 
// 3) We print out those elements in a for loop 


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