var i: integer;
str1: string;
begin
str1 := richedit1.Text;
if richedit1.Text <> '' then
begin
for i := 0 to length(str1) do
if (str1[i] >= '0') and (str1[i] <= '9') then
begin
richedit1.SelStart := i-1;
richedit1.SelLength := 1;
RichEdit1.SelAttributes.Color := clRed;
RichEdit1.SelAttributes.Size := 15;
RichEdit1.SelAttributes.Name := '楷体';