You don't need to use regular expressions if you just want to split a string by multiple spaces. Writing your own regex library is overkill for something that simple.
The answer you linked to in your comments, Split a string in C++?, can easily be changed so that it doesn't include any empty elements if there are multiple spaces.
std::vector<std::string> &split(const std::string &s, char delim,std::vector<std::string> &elems) {
std::stringstream ss(s);
std::string item;
while (std::getline(ss, item, delim)) {
if (item.length() > 0) {
elems.push_back(item);
}
}
return elems;
}
std::vector<std::string> split(const std::string &s, char delim) {
std::vector<std::string> elems;
split(s, delim, elems);
return elems;
}
By checking that item.length() > 0
before pushing item
on to the elems
vector you will no longer get extra elements if your input contains multiple delimiters (spaces in your case)