check if string contains all numeric data

I'm sure this is very easy to do, I need to check if a string to see if it only contains numbers I was wondering if there was a built in function for something like this.  Also is there a built in function to search a string for a particular character.
ICPooremanAsked:
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geobulCommented:
Hi,

About your second question see Pos function:

i := Pos('x', StrVar);

About the first one:

function IsNumeric(const s: string): boolean;
var i: integer;
begin
  result := false;
  for i := 1 to Length(s) do begin
    if not (s[i] in ['0'..'9']) then exit;
  end;
  result := true;
end;

// usage:
procedure TForm1.Button1Click(Sender: TObject);
begin
  if IsNumeric(Edit1.Text) then ShowMessage('OK');
end;

Regards, Geo
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