C# 正则表达式语法定义

Regex reg = new Regex("-"); // Split on hyphens.
        string[] s = reg.Split("first-second-third");
        for (int i = 0; i < s.Length; i++)
        {
            Response.Write(s[i] + "<br>");
        }


        string text = "1A　2B　3C　4D　5E　6F　7G　8H　9I　10J　11Q　12J　13K　14L　15M　16N　ffee80　#800080";
        string pattern = @"((\d+)([a-z]))+";
        Regex r = new Regex(pattern, RegexOptions.IgnoreCase);
        MatchCollection matchCollection = r.Matches(text);
       
        foreach (Match m in matchCollection)
        {
            Response.Write(m.ToString()+"<br>");
        }
        //匹配正确返回真（true） 否则返回假（false）
        //Regex.IsMatch("字符串","表达式",RegexOptions.IgnoreCase);
        //Response.Write(r.Match(text)); 只匹配第一个

        MatchCollection mc;
        r = new Regex("match");
        mc = r.Matches("matchcollectionregexmatchs");
        for (int i = 0; i < mc.Count; i++)
        {
            Response.Write(mc[i].Value + " POS:" + mc[i].Index.ToString() + "<br>");
        }