operator<<(std::sub_match)

From cppreference.com
< cpplrm; | regexlrm; | sub match
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)

Writes the representation of the matched subsequence m to the output stream os.

Equivalent to os << m.str().

Parameters

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

Return value

os.

Example