Go from end of string to "/" and assign to var C++

Question

Here is my filepath my/example/path I need to capture /path and assign it to a variable. I don't know if this involves regex, what is the best way to do this in C++?

I dont think this require regex just loop through the characters and save the position of `/` each time you encounter it, so at the end you have the last one position and from there you are good to go — Eraklon, Feb 22 '20 at 21:46
Regular expressions would be overkill here. Read about `std::basic_string::rfind`. — Pete Becker, Feb 22 '20 at 21:47
This might help you https://stackoverflow.com/questions/10058606/splitting-a-string-by-a-character — Tarek Dakhran, Feb 22 '20 at 21:59

score -1 · Accepted Answer · answered Feb 22 '20 at 21:59

The fun thing is that http://www.cplusplus.com/reference/string/string/find_last_of/ has an example which almost exactly what you are looking for.

// string::find_last_of
#include <iostream>       // std::cout
#include <string>         // std::string
#include <cstddef>         // std::size_t

void SplitFilename (const std::string& str)
{
  std::cout << "Splitting: " << str << '\n';
  std::size_t found = str.find_last_of("/\\");
  std::cout << " path: " << str.substr(0,found) << '\n';
  std::cout << " file: " << str.substr(found+1) << '\n'; // you will need `found` only
}

int main ()
{
  std::string str1 ("/usr/bin/man");
  std::string str2 ("c:\\windows\\winhelp.exe");

  SplitFilename (str1);
  SplitFilename (str2);

  return 0;
}

Output

Splitting: /usr/bin/man
 path: /usr/bin
 file: man
Splitting: c:\windows\winhelp.exe
 path: c:\windows
 file: winhelp.exe

Go from end of string to "/" and assign to var C++

1 Answers1