正则表达式替换数字字符串

Question

请教高手:12345怎样替换成1,2,3,4,5

Answer 1

  string str = "";
            Match match1 = new Regex(@"\d" ).Match("12345");
            while (match1.Success)
            {
                str+= match1.Groups[0].Value + "," ;
                match1 = match1.NextMatch();
            }
            MessageBox.Show(str.TrimEnd(','));

Answer 2

            string str = @"12345";
            Regex reg = new Regex(@"\d");
            str = reg.Replace(str, "$0,");

Answer 3

try...string test = "12345";
Regex reg = new Regex(@"(?<=.)(?=.)");
string result = reg.Replace(test, ",");
richTextBox2.Text = result;
/*-------输出--------
1,2,3,4,5
*/