c++ split string by double newline
c++, split, string
Solution
`find_first_of` only looks for single characters. What you're telling it to do by passing it `"\n\n"`, is to find the first of either `'\n'` or `'\n'`, and that's redundant. Use `string::find` instead.
`boost::split` also works by examining only one character at a time.
Problem
I have been trying to split a string by double newlines (`"\n\n"`). ``` input_string = "firstline\nsecondline\n\nthirdline\nfourthline"; size_t current; size_t next = std::string::npos; do { current = next + 1; next = input_string.find_first_of("\n\n", current); cout << "[" << input_string.substr(current, next - current) << "]" << endl; } while (next != std::string::npos); ``` gives me the output ``` [firstline] [secondline] [] [thirdline] [fourthline] ``` which is obviously not what I wanted. I need to get something like ``` [first line second line] [third line fourthline] ``` I have also tried `boost::split` but it gives me the same result. What am I missing?