wxString str = "hello world"; wxString subStr = "world"; int index = str.find(subStr);
wxString str = "hello world"; wxString subStr = "l"; int index = str.find(subStr, 3);In this example, the `find` function will start searching for the substring "l" from the 4th character (index 3) of the string "hello world". It will find the substring at index 3, which is the second occurrence of "l" in the string. Package library: wxString is a part of the wxWidgets library, which is a cross-platform GUI toolkit for C++.