官方的正则表达式组件 RegularExpressions (3) : TMatchEvaluator

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, RegularExpressions;



type

  TForm1 = class(TForm)

    Memo1: TMemo;

    Button1: TButton;

    procedure Button1Click(Sender: TObject);

  private

    function MyMatchEvaluator(const Match: TMatch): string; //TMatchEvaluator = function(const Match: TMatch): string of object;

  public

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



const

  pattern = '[A-Z]+\d+';

  txt = 'AAA1 BBB2 AA11 BB22 A111 B222 AAAA';



procedure TForm1.Button1Click(Sender: TObject);

begin

  Memo1.Text := TRegEx.Replace(txt, pattern, MyMatchEvaluator); //aaa1 bbb2 aa11 bb22 a111 b222 AAAA

end;



function TForm1.MyMatchEvaluator(const Match: TMatch): string;

begin

  Result := LowerCase(Match.Value);

end;



end.

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