Here's an "extension" function for the RTL Pos function. The LastPos returns an integer specifying the position of the LAST occurrence of one string within another.
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function LastPos(const SubStr: String; const S: String): Integer;
begin
result := Pos(Reverse(SubStr), Reverse(S)) ;
if (result <> 0) then
result := ((Length(S) - Length(SubStr)) + 1) - result + 1;
end;
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