How do I Search/Find and Replace in a standard string?

Question

How do I replace all occurrences of a substring with another string, for std::strings?

std::string s ("One hello, two hellos.");
s = s.replace("hello", "world");  // something like this

Answer 1

Why not implement your own replace?

void myReplace(std::string& str,
               const std::string& oldStr,
               const std::string& newStr)
{
  std::string::size_type pos = 0u;
  while((pos = str.find(oldStr, pos)) != std::string::npos){
     str.replace(pos, oldStr.length(), newStr);
     pos += newStr.length();
  }
}