How to find the desired text in a string, between characters?

Question

Python

Good evening!
Tell me how to implement the function in python:
We have text on the page -

-----AAAaaaaAAAf-----<br />	
текст овер 300 знаков<br />
-----AAAaaaaAAAf -----<br />

Take out from the string everything that is between -----AAAaaaaAAAf -----<br />and <br />
There was a good function on Delphi

function Pars(T_, ForS, _T: string): string;
var
  a, b: integer;
begin
  Result := '';
  if (T_ = '') or (ForS = '') or (_T = '') then  Exit;
  a := Pos(T_, ForS);
  if a = 0 then    Exit
  else  a := a + Length(T_);

  ForS := Copy(ForS, a, Length(ForS) - a + 1);
  b := Pos(_T, ForS);
  if b > 0 then Result := Copy(ForS, 1, b - 1);
end;

In it, you could easily get what you need by calling it:
text:= Pars(' MESSAGE -----<br />',str,'<br />');
Maybe someone has an analogue of this function for python?