C++ - Split string by regex

Question

I want to split std::string by regex.

I have found some solutions on Stackoverflow, but most of them are splitting string by single space or using external libraries like boost.

I can't use boost.

I want to split string by regex - "\\s+".

I am using this g++ version g++ (Debian 4.4.5-8) 4.4.5 and i can't upgrade.

Answer 1

#include <regex>  std::regex rgx("\\s+"); std::sregex_token_iterator iter(string_to_split.begin(),     string_to_split.end(),     rgx,     -1); std::sregex_token_iterator end; for ( ; iter != end; ++iter)     std::cout << *iter << '\n'; 

The -1 is the key here: when the iterator is constructed the iterator points at the text that precedes the match and after each increment the iterator points at the text that followed the previous match.

If you don't have C++11, the same thing should work with TR1 or (possibly with slight modification) with Boost.