Question

There is Regex in c# which I can use to remove some arbitrary characters or character ranges like Regex.Replace(str, "[^a-zA-Z0-9_.]+", "", RegexOptions.Compiled). But what is the equivalent of that in C++. I know Boost has a regex library in it. But for this operation , is it viable and how performant it is ? What is the best and fast way to remove characters from a string in c++ ?

Answer 1

You probably want boost::regex_replace :

#include <boost/regex.hpp>
#include <string>

const std::string input; 
boost::regex matcher("[^a-zA-Z0-9_.]+");
const std::string formatter("");

std::string output = boost::regex_replace(input, matcher, formatter);