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// basic_regex::assign
// note: using regex, a standard alias of basic_regex<char>
#include <iostream>
#include <string>
#include <regex>
int main ()
{
std::string pattern ("six");
std::regex first;
std::regex second (pattern);
first.assign (second);
second.assign ("[0-9A-F]+", std::regex::ECMAScript);
second.assign ({'^','a'}, std::regex::ECMAScript | std::regex::icase );
using namespace std::regex_constants; // introducing constants
second.assign (pattern, ECMAScript | icase );
std::string subject = "Sixty six";
std::string replacement = "seven";
std::cout << "first: " << std::regex_replace (subject, first, replacement);
std::cout << std::endl;
std::cout << "second: " << std::regex_replace (subject, second, replacement);
std::cout << std::endl;
return 0;
}
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