Is it possible in C++ to replace part of a string with another string?
Basically, I would like to do this:
QString string("hello $name");
string.replace("$name", "Somename");
But I would like to use the Standard C++ libraries.
There's a function to find a substring within a string (find
), and a function to replace a particular range in a string with another string (replace
), so you can combine those to get the effect you want:
bool replace(std::string& str, const std::string& from, const std::string& to) {
size_t start_pos = str.find(from);
if(start_pos == std::string::npos)
return false;
str.replace(start_pos, from.length(), to);
return true;
}
std::string string("hello $name");
replace(string, "$name", "Somename");
In response to a comment, I think replaceAll
would probably look something like this:
void replaceAll(std::string& str, const std::string& from, const std::string& to) {
if(from.empty())
return;
size_t start_pos = 0;
while((start_pos = str.find(from, start_pos)) != std::string::npos) {
str.replace(start_pos, from.length(), to);
start_pos += to.length(); // In case 'to' contains 'from', like replacing 'x' with 'yx'
}
}