Question

Looking for something similar to Python’s regex sub or subn methods.

http://docs.python.org/library/re.html

So basically a C/C++ api like this

re.sub(pattern, repl, string, count=0, flags=0)

Where I can put a function pointer for repl like you can in Python.

Answer 1

Take a look at regex_replace

#include <iostream>
#include <regex>
#include <string>
int main()
{
   std::string text = "Quick brown fox";
   std::regex vowel_re("a|o|e|u|i");
   std::cout << std::regex_replace(text, vowel_re, "[$&]") << '\n';
}

Output:

Q[u][i]ck br[o]wn f[o]x