title: How do I insert a string into another string in Lua?
body: <p>Is there a function in Lua that returns a string inserted into another one on given position?</p>
  
  <p>For example <code>string.insert(str1, str2, pos)</code>.</p>
  
  <p>Using it: <code>string.insert('Hello World!', 'My ', 6)</code> becomes<code>Hello My World!</code> and so on.</p>