Syntax:  SUBSTITUTE search_string replace_string substitute_type

  Replaces occurrences of one text string with another.

  This command replaces an occurrence of a search string with the
  specified replace string.  It searches for the string in the current
  direction.

  LSE performs case matching when replacing text.  For example, if a
  word in a search string is all uppercase, all the letters in the
  corresponding replace string become uppercase.  LSE prompts you for
  confirmation before the replacement is made.  If you specify the
  parameter value all in response to the confirmation prompt, all
  occurrences of the search string are replaced with the replace
  string.