In C++ how do I use regex to replace a string match

In C++11 the regex library was added which allows you to do regex directly:

#include <string>
#include <regex>
...
std::string workingOn("this text string\n");

std::regex expressionStart("^th");
std::string removed = std::regex_replace(workingOn, expressionStart,"");
// removed will contain "is text string"

std::regex expressionReplace("\\bte([^ ]*)");
// match word beginning with 'te' and grab everything to the end of it
// which will be stored in $1 as the first captured match
std::string replaced = std::regex_replace(workingOn, expressionReplace,"ve$1");
// replaced will contain "this vext string"
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