/Delphi/How to validate if the text in edit has numbers in and to show a message if it has in delphi

How to validate if the text in edit has numbers in and to show a message if it has in delphi

// Taking OP question obsessively literally, this 
// function doesn't allow negative sign, decimals, or anything
// but digits
function IsValidEntry(s:String):Boolean;
var
  n:Integer;
begin
  result := true;
  for n := 1 to Length(s) do begin
    if (s[n] < '0') or (s[n] > '9') then
    begin
       result := false;
       exit;
    end;
  end;
end;

Source: stackoverflow.com

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