Replace in a loop

Question

I have a buffer that contains this sentence :

I go to a rendez-vous this evening.

and I have this function :

function MyFunction()
  let myList = ["rendez-vous"]
  let myFile = readfile(bufname(1))
  for elem in myList
      if match(myFile,elem)!=-1
              echo elem
          let elem2 = substitute(elem, '-', 'µ', 'gn')
          echo elem2
          exe '%s/'elem.'/'elem2    
      endif
  endfor
endfunction 

In my buffer, rendez-vous not become rendezµvous. Could you tell me why, please ?

Answer 1

This is the solution :

function MyFunction()
  let myList = ["rendez-vous"]
  let myFile = readfile(bufname(1))
  for elem in myList
      if match(myFile,elem)!=-1
              echo elem
          let elem2 = substitute(elem, '-', 'µ', 'g')
          echo elem2
          exe '%s/'.elem.'/'.elem2.'/gn'    
      endif
  endfor
endfunction