Finding "*" characters in a string

Code

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using System.Text.RegularExpressions;

        private void button1_Click(object sender, EventArgs e)

        {

            Regex rex = new Regex("[*]*");

             foreach(Match m in rex.Matches(richTextBox1.Text))

            {

                // Preserve  Position of Cursor

                int pos = richTextBox1.SelectionStart; 

                richTextBox1.Select(m.Index, m.Value.Length);

                richTextBox1.SelectionColor = Color.Red;

                richTextBox1.SelectionStart = pos;

                richTextBox1.SelectionColor = Color.Black;

            }

        }

if you want to change Color in realTime when user types the Text then Just Place the code in TextChanged Event instead of Button Click :)