std::string template_str = R"(
 GPU device № info
      device name=HD Graphics 530
      vendor name=Intel
      memory info= memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64)
 GPU device № info
      device name=HD Graphics 530
      vendor name=jsdjksjk Corporation
      memory info= memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64)
 GPU device № info
      device name=HD Graphics 530
      vendor name=jsdjksjk jhwqghj()
      memory info= memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64)
)";

int main()
{
  ///*
  std::regex vendor_regex( R"(^\s*vendor name=([\w\ \(\)=\-:]*)$)", std::regex::ECMAScript );
  std::smatch vendor_result;
  if( std::regex_match( template_str, vendor_result, vendor_regex ) )
  {
       for( const auto & vendor_res : vendor_result )
       {
               std::cout << vendor_res.str() << " matched" << std::endl;
       }
  }
  else
  std::cout << "No" << std::endl;
  //*/
 

return 0;
}