I'm trying to split a string based on space except when inside quotes. This is the regex I found online (\\w |\".*?\"). However, when I try to use std::regex to split a string, I get only empty strings.

This is the code I have to split:

std::regex exp("[^\\s\"'] |\"([^\"]*)\"|'([^']*)'");

std::sregex_token_iterator itr(s.begin(), s.end(), exp, -1);
std::sregex_token_iterator end;

for (; itr != end; itr  )
    std::cout << *itr << std::endl;

This prints out only " " when I pass a string like "A "B C" 123". What could I be doing wrong?

CodePudding user response：

From documentation for std::sregex_token_iterator:

submatch - the index of the submatch that should be returned. "0" represents the entire match, and "-1" represents the parts that are not matched (e.g, the stuff between matches).

Since you're passing -1, it means you're printing the parts that didn't match, not the parts that matched.