问在字符串中使用\作为文字，而不是转义

EN

bool stringMatch(const char *expr, const char *str) {   
   // do something to compare *(expr+i) == '\\'  
   // In this case it is comparing against a backslash
   // i is some integer
}

int main() {
    string a = "a\\sb";
    string b = "a b";
    cout << stringMatch(a.c_str(), b.c_str()) << endl;
    return 1;
}

bool stringMatch(const char *expr, const char *str) {   
   // do something to compare *(expr+i) == '\\'  
   // In this case it is comparing against a backslash
   // i is some integer
}

int main() {
    string a = "a" "\x5C" "sb";
    string b = "a b";
    cout << stringMatch(a.c_str(), b.c_str()) << endl;
    return 1;
}

expr=[expr stringByReplacingOccurrencesOfString:@"\\\\" withString:@"\\"];

void searchAndReplace(std::string& value, std::string const& search,std::string const& replace)
{
    std::string::size_type  next;

    for(next = value.find(search);        // Try and find the first match
        next != std::string::npos;        // next is npos if nothing was found
        next = value.find(search,next)    // search for the next match starting after
                                          // the last match that was found.
       )
    {
        // Inside the loop. So we found a match.
        value.replace(next,search.length(),replace);   // Do the replacement.
        next += replace.length();                      // Move to just after the replace
                                                       // This is the point were we start
                                                       // the next search from. 
    }
}

expr.replace(/*size_t*/ pos1, /*size_t*/ n1, /*const string&*/ str );

string a = R"raw(a\sb)raw";

#include <iostream>
#include <string>

int main() {
    std::string a = "a\\sb";
    std::cout << a.size() << ' ' << a << '\n';
}