RegExpress, C++ (gcc)

Language: Layout:

//g++  7.4.0

/////////////////////////////////////////////////////////////////////////////
//RegExpress
//this code is created by Rezaul Hoque on July 05,2022;
//contact:jewelmrh@yahoo.com;Dhaka,Bangladesh;https://rezaulhoque.wordpress.com,https://hoquestake.blogspot.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their learning;
//////////////////////////////////////////////////////////////////////////////
#include <iostream>
#include <string>
#include <regex>
#include <iterator>

int main()
{
    std::string a="It's Tuesday! Time for a walk!\n";
std::regex WC("(\\w+)");
auto startWc=std::sregex_iterator(a.begin(),a.end(),WC);
auto endWc=std::sregex_iterator ();
std::cout<<"There are "<<std::distance (startWc,endWc)<<" words.\n";
std::regex look("Tuesday");
std::regex_replace(std::ostreambuf_iterator<char>(std::cout),a.begin(),a.end(),look,"__");
std::cout<<std::regex_replace(a,look,"[$&]");
return 0;

}

Show compiler warnings [ + ] Compiler args [ + ] Show input
Compilation time: 10.3 sec, absolute running time: 0.99 sec, cpu time: 0.02 sec, memory peak: 5 Mb, absolute service time: 11,36 sec