operator<<(std::sub_match)

Since C++11

Writes the representation of the matched subsequence m to the output stream os. Equivalent to os « m.str().

# Declarations

template< class CharT, class Traits, class BidirIt >
std::basic_ostream<CharT,Traits>&
operator<<( std::basic_ostream<CharT,Traits>& os, const sub_match<BidirIt>& m );

(since C++11)

# Parameters

os: output stream to write the representation to
m: a sub-match object to output

# Return value

# Example

#include <iostream>
#include <regex>
#include <string>
 
int main()
{
    std::string sentence{"Quick red fox jumped over a lazy hare."};
    const std::regex re{"([A-z]+) ([a-z]+) ([a-z]+)"};
    std::smatch words;
    std::regex_search(sentence, words, re);
    for (const auto& m : words)
        // m has type `const std::sub_match<std::string::const_iterator>&`
        std::cout << '[' << m << "] ";
    std::cout << '\n';
}