replace_all
Description:
[ Version ( since = "3.10" ) ]
public uint replace_all (string replace, int replace_length) throws Error
  public uint replace_all (string replace, int replace_length) throws Error
Replaces all search matches by another text.
It is a synchronous function, so it can block the user interface.
For a regular expression replacement, you can check if replace is valid by calling 
      check_replacement. The replace text can contain
      backreferences; read the replace documentation for more details.
Parameters:
| this | |
| replace | the replacement text. | 
| replace_length | the length of  | 
Returns:
| the number of replaced matches. |