C++ std::string String replacement
Example
Replace by position
To replace a portion of a std::string you can use the method replace from std::string.
replace has a lot of useful overloads:
//Define string
std::string str = "Hello foo, bar and world!";
std::string alternate = "Hello foobar";
//1)
str.replace(6, 3, "bar"); //"Hello bar, bar and world!"
//2)
str.replace(str.begin() + 6, str.end(), "nobody!"); //"Hello nobody!"
//3)
str.replace(19, 5, alternate, 6, 6); //"Hello foo, bar and foobar!"
C++14
//4)
str.replace(19, 5, alternate, 6); //"Hello foo, bar and foobar!"
//5)
str.replace(str.begin(), str.begin() + 5, str.begin() + 6, str.begin() + 9);
//"foo foo, bar and world!"
//6)
str.replace(0, 5, 3, 'z'); //"zzz foo, bar and world!"
//7)
str.replace(str.begin() + 6, str.begin() + 9, 3, 'x'); //"Hello xxx, bar and world!"
C++11
//8)
str.replace(str.begin(), str.begin() + 5, { 'x', 'y', 'z' }); //"xyz foo, bar and world!"
Replace occurrences of a string with another string
Replace only the first occurrence of replace with with in str:
std::string replaceString(std::string str,
const std::string& replace,
const std::string& with){
std::size_t pos = str.find(replace);
if (pos != std::string::npos)
str.replace(pos, replace.length(), with);
return str;
}
Replace all occurrence of replace with with in str:
std::string replaceStringAll(std::string str,
const std::string& replace,
const std::string& with) {
if(!replace.empty()) {
std::size_t pos = 0;
while ((pos = str.find(replace, pos)) != std::string::npos) {
str.replace(pos, replace.length(), with);
pos += with.length();
}
}
return str;
}
