Here is sample code that will help search and replace characters in a string.

The example code is searching for the "é" character, which is 142 on the ascii chart. It will be replaced by the character "t".

For ($i;1;Length(vstring))

   If (Ascii(vstring[[$i]])=142)

     vstring[[$i]]:="t" ` replace the character

   End if

End for