private void button_Test_Click(object sender, System.EventArgs e)
{
string tmpstr1 = Regex.Match(this.textBox_String_to_Test.Text, this.textBox_Regular_Expression.Text,RegexOptions.IgnoreCase).ToString();
string tmpstr2 = tmpstr1.Substring(1,tmpstr1.Length-2);
this.textBox_Result_will_show_here.Text = tmpstr2;
}