str::size_type extract_delimited_text(const str& in, const str& d1, const str& d2, str& out, size_t pos)
{
if(pos == str::npos)
return pos;
size_t end = pos;
if((pos = in.find(d1, pos)) != str::npos)
if((end = in.find(d2, (pos = pos + d1.size()))) != str::npos)
{
out = in.substr(pos, end - pos);
return end + d2.size();
}
return str::npos;
}
bool is_multi_line(const str& s)
{
return s.find('\n') != str::npos;
}
