operator<< <regex>
Inserts a sub_match in a stream.
Syntax
template<class Elem, class IOtraits, class Alloc, class BidIt>
basic_ostream<Elem, IOtraits>&
operator<<(basic_ostream<Elem, IOtraits>& os,
const sub_match<BidIt>& right);
Parameters
Elem
The element type.IOtraits
The string traits class.Alloc
The allocator class.BidIt
The iterator type.os
The output stream.right
The object to insert.
Remarks
The template operator returns os << right.str().
Example
// std_tr1__regex__operator_ins.cpp
// compile with: /EHsc
#include <regex>
#include <iostream>
int main()
{
std::regex rx("c(a*)|(b)");
std::cmatch mr;
std::regex_search("xcaaay", mr, rx);
std::csub_match sub = mr[0];
std::cout << "whole match: " << sub << std::endl;
return (0);
}
whole match: caaa
Requirements
Header: <regex>
Namespace: std