CODEWITHSUNDEEP
c++regex
marco
marco

Reputation: 351

regular expression not evaluating string correctly

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?

Upvotes: 1

Views: 61

Answers (1)

Mark Ransom
Mark Ransom

Reputation: 308482

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.

Upvotes: 3

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