delphi 截取指定符号之间的字符串-随机读取

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls;

type
  TForm1 = class(TForm)
    test: TMemo;
    Button1: TButton;
    Memo1: TMemo;
    Label1: TLabel;
    procedure Button1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function   PosEx(const   Source,   Sub:   string;   Index:   integer):   integer;
var
   Buf                               :   string;
   i,   Len,   C                   :   integer;
begin
   C   :=   0;
   Result   :=   0;
   Buf   :=   Source;
   i   :=   Pos(Sub,   Source);
   Len   :=   Length(Sub);
   while   i   <>   0   do
   begin
       inc(C);
       Inc(Result,   i);
       Delete(Buf,   1,   i   +   Len   -   1);
       i   :=   Pos(Sub,   Buf);
       if   C   >=   Index   then   Break;
       if   i   >   0   then   Inc(Result,   Len   -   1);
   end;
   if   C   <   Index   then   Result   :=   0;
end;

procedure TForm1.Button1Click(Sender: TObject);
var
t,y:integer;
o,x,c:string;
g,p,g1:integer;

begin
memo1.text:='';
 for p:=0 to 5 do
 BEGIN

Randomize;
t := random(20);
while (t < 1) do
t := random(20);

 label1.Caption:=inttostr(t);

            y:=t+1;

 c:='topfox000|topfox001|topfox002|topfox003|topfox004|topfox005|topfox006|topfox0007|topfox008|topfox009|tellyoumysecret000|tellyoumysecret002|tellyoumysecret003|tellyoumysecret004|tellyoumysecret005|tellyoumysecret006|'+
'onhacker046|onionhacker047|onionhacker048|onionhacker049|onionhacker140|onionhacker141|onionhacker142|onionhacker143|onionhacker144';
 test.text:=test.text+#13#10+inttostr(PosEx( c, '|',t));//返回5
  g:= PosEx( c, '|',t);//返回5
test.text:=test.text+#13#10+inttostr(PosEx( c, '|',y));//返回5
   g1:=PosEx( c, '|',y);//返回5
x:=Copy(c,g,g1-g);

     memo1.text:=memo1.text  +x;
 END;

end;
procedure TForm1.FormCreate(Sender: TObject);
begin
memo1.Text:='';
end;

end.