how to seach line by line and return matched lines in C++ -

i need search key word "stack overflow" in std::string , return lines sting found.

so std::string might this,

ghfhfhfhf dghfhf dtgd \n dgdhfghfgfh  stack overflow \n stack overflow dgdfgdgdg  \n dgdgh dgdrgdrgdg  \n stack overflow dffdbdb  \n 

notice, thee multiple lines in std::string "\n" indicating end of line. function search "stack overflow" , return vector of sting contains lines match.

for example, return vector like,

v[0]  dgdhfghfgfh  stack overflow \n v[1]  stack overflow dgdfgdgdg  \n v[2]  stack overflow dffdbdb  \n 

the goal know how many lines had hit , did line like. can please me this?

this needs run on linux redhat.

you can put each line std::string and, using find("stack overflow"), search substring. once found, push vector:

while (std::getline(file, line)) {     if (line.find("stack overflow") != line.end())         v.push_back(line); } 

the above works strings if wrap string std::stringstream , use in place of file.