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...compare strings with pattern matching?
Autor: David Stidolph
[ Print tip ]  

Tip Rating (12):  
     


function Matchstrings(Source, pattern: string): Boolean;
var
  
pSource: array [0..255] of Char;
  pPattern: array [0..255] of Char;

  function MatchPattern(element, pattern: PChar): Boolean;

    function IsPatternWild(pattern: PChar): Boolean;
    var
      
t: Integer;
    begin
      
Result := StrScan(pattern, '*') <> nil;
      if not Result then Result := StrScan(pattern, '?') <> nil;
    end;
  begin
    if 
0 = StrComp(pattern, '*') then
      
Result := True
    else if (element^ = Chr(0)) and (pattern^ <> Chr(0)) then
      
Result := False
    else if element^ = Chr(0) then
      
Result := True
    else 
    begin
      case 
pattern^ of
        
'*': if MatchPattern(element, @pattern[1]) then
            
Result := True
          else
            
Result := MatchPattern(@element[1], pattern);
          '?': Result := MatchPattern(@element[1], @pattern[1]);
        else
          if 
element^ = pattern^ then
            
Result := MatchPattern(@element[1], @pattern[1])
          else
            
Result := False;
      end;
    end;
  end;
begin
  
StrPCopy(pSource, Source);
  StrPCopy(pPattern, pattern);
  Result := MatchPattern(pSource, pPattern);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  if 
Matchstrings('Sean Stanley', 'Sean*') then ShowMessage('strings match!');
  if Matchstrings('Sean', 'Se?n') then ShowMessage('strings match!');
  if not Matchstrings('Sean', 'Se?nn') then ShowMessage('strings don''t match!');
end;


 

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