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// basic_regex constructors
// note: using regex, a standard alias of basic_regex<char>
#include <iostream>
#include <string>
#include <regex>
int main ()
{
std::string pattern = "^.*$";
std::regex first; // default
std::regex second = first; // copy
std::regex third (pattern); // string object initialization
std::regex fourth ("<[^>]>"); // string literal initialization
std::regex fifth (pattern.begin(),pattern.end()); // range initialization
std::regex sixth {'.','+'}; // initializer_list initialization
std::regex seventh ("[0-9A-Z]+", std::regex::ECMAScript);// with syntax option
using namespace std::regex_constants; // introducing constants namespace
std::regex eighth ("[0-9A-Z]+", ECMAScript); // same as seventh
std::regex ninth ("\\bd\\w+", ECMAScript | icase ); // multiple flags
std::string subject = "Duddy the duck";
std::string replacement = "yup";
std::cout << std::regex_replace (subject, ninth, replacement);
std::cout << std::endl;
return 0;
}
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