Search pattern in string using wildcard in Delphi?

Question

I used to use HYPERSTR library for string processing routine. Now I use newer Delphi. I need to search a pattern in a string, for example the old function is function IsMatchEx(const Source, Search:AnsiString; var Start:integer) : Integer;. Actually I don't need the result value, I just wanna know if the pattern match with the string or not.

My old code (returns TRUE):

var
  StartPos: integer;
  FoundPos: integer;
begin
  StartPos := 1;
  FoundPos := IsMatchEx('abcdef', 'abcd?f', StartPos);
  if FoundPos > 0 then
    showmessage('match');
end;

I see that Delphi XE has TRegEx but I stil don't understand to use it.

These code doesn't return TRUE :

  if TRegEx.IsMatch('abcdef', 'abcd?f') then
    showmessage('match');

I also got same result when using MatchesMask.

Thanks.