There is no one built-in function in C++ to do this. If you'd like to replace all instances of one substring with another, you can do so by intermixing calls to string::find and string::replace. For example:
size_t index = 0; while (true) { /* Locate the substring to replace. */ index = str.find("abc", index); if (index == std::string::npos) break; /* Make the replacement. */ str.replace(index, 3, "def"); /* Advance index forward so the next iteration doesn't pick it up as well. */ index += 3; } In the last line of this code, I've incremented index by the length of the string that's been inserted into the string. In this particular example - replacing "abc" with "def" - this is not actually necessary. However, in a more general setting, it is important to skip over the string that's just been replaced. For example, if you want to replace "abc" with "abcabc", without skipping over the newly-replaced string segment, this code would continuously replace parts of the newly-replaced strings until memory was exhausted. Independently, it might be slightly faster to skip past those new characters anyway, since doing so saves some time and effort by the string::find function.
Hope this helps!
