Cleaning a data file to be read as only numbers in C++

Question

I need to read with C++ a file with extension .wdx (Mathematica provided). I've been able to get the file as a .dat and .txt obtaining something like this minimal example (dummyValues.dat):

{5.12, 0.1, 0.25}   {{0.10, 4, 3, 2, 1, 1.44, 10.2}}       {11.1, 12.2, 13.3, 14.4, 15.5, 16.6} X

As you can see it's a mess with blank spaces and {, } symbols. I'm only interested on getting a file with numbers (decimal is indicated with dot, '.'). How can I do this through the .wdx file or the .dat?

---

I have tried this

#include<iostream>
#include<cmath>
#include<string>
#include"complejos.h"//'using namespace std;' command is in here
#include<fstream>
#include<iomanip>

int main() {

double dato;
char aux;
ifstream benchmarks;

benchmarks.open("dummyValues.dat");

if (benchmarks.is_open()) {//first if

  benchmarks.get(aux);

  while (aux != "X") {

    if (aux == "{" || aux == "}" || aux == "," || aux == " ") {
      benchmarks.get(aux);
    } else {
      benchmarks>>dato;
      cout<<dato;
      benchmarks.get(aux);
    };
  };//end of while

} else {
  cout<<"ERROR: couldnt open the file"<<endl;
};//end of first if



benchmarks.close();

return 0;
}; //end of main

But I get this error:

error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   while (aux != "X") {
                 ^~~
 error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
     if (aux == "{" || aux == "}" || aux == "," || aux == " ") {
                ^~~
 error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
     if (aux == "{" || aux == "}" || aux == "," || aux == " ") {
                              ^~~
 error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
     if (aux == "{" || aux == "}" || aux == "," || aux == " ") {
                                            ^~~
error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
     if (aux == "{" || aux == "}" || aux == "," || aux == " ") {