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Delphi provides a straight forward function can replace string - StringReplace


Below code shows an example

unit Unit1;
 
interface
 
uses
  SysUtils,   // Unit containing the stringreplace command
  Forms, Dialogs;
 
type
  TForm1 = class(TForm)
    procedure FormCreate(Sender: TObject);
  end;
 
var
  Form1: TForm1;
 
implementation
{$R *.dfm} // Include form definitions
 
procedure TForm1.FormCreate(Sender: TObject);
var
  before, after : string;

begin
  // Try to replace all occurrences of a or A to THE
  before := 'This is a way to live A big life';

  after  := stringreplace(before, ' a ', ' THE ',
                          [rfReplaceAll, rfIgnoreCase]);
  ShowMessage('Before = '+before);
  ShowMessage('After  = '+after);
end;