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Simple c++ exercise which runs sed command from c++ program. The sed is done in a separate routine. The routine is called with string and sed parameters.

main.cpp
  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  5. #include "my_regexp.h"
  7. //g++ -g -std=c++0x main.cpp my_regexp.cpp
  9. int main() {
  10.   string s0("Tin 454 s1");
  11.   string r("\\(T.*\\) [0-9]* \\(.*\\)/\\1 \\2");
  12.   string s1;
  14.   s1 = reg_replace(s0, r);
  15.   cout << s0 << " " << r << endl;
  16.   cout << s1 << endl;
  18.   return 0;
  19. }

my_regexp.cpp
  1. #include <iostream>
  2. #include <string>
  3. using namespace std;
  5. string reg_replace(string& str, string& sed) {
  6.   string cmd("echo ");
  7.   cmd = cmd + "\"" + str + "\" | sed 's/" + sed + "/'";
  9.   FILE* pfd = popen(cmd.c_str(), "r");
  10.   
  11.   if (pfd)
  12.   {
  13.     while (!feof(pfd))
  14.     {
  15.       char buf[1024] = {0};
  16.       
  17.       if (fgets(buf, sizeof(buf), pfd) > 0)
  18.        return buf;
  19.     }
  20.     pclose(pfd);
  21.   }
  22. }
my_regexp.h

string reg_replace(string& str, string& sed);



The output looks like:

  1. ./a.out
  2. Tin 454 s1 \(T.*\) [0-9]* \(.*\)/\1 \2
  3. Tin s1
Similar links:
c++ exercise, which uses boost to implement regular expression replace.

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