黄聪：C#用正则表达式获得指定开始和结束字符串中间的一段文本

/// <summary>
/// 获得字符串中开始和结束字符串中间得值
/// </summary>
/// <param name="str"></param>
/// <param name="s">开始</param>
/// <param name="e">结束</param>
/// <returns></returns>
public static string GetValue(string str, string s, string e)
{
Regex rg = new Regex("(?<=(" + s + "))[.\\s\\S]*?(?=(" + e + "))", RegexOptions.Multiline | RegexOptions.Singleline);
return rg.Match(str).Value;
}

 /// <summary>
    /// 截取字符串过多+……
    /// </summary>
    /// <param name="inputString">字符串</param>
    /// <param name="len">长度</param>
    /// <returns>string</returns>
    public static string CutString(string inputString, int len)
    {
        ASCIIEncoding ascii = new ASCIIEncoding();
        int tempLen = 0;
        string tempString = "";
        byte[] s = ascii.GetBytes(inputString);
        for (int i = 0; i < s.Length; i++)
        {
            if ((int)s[i] == 63)
            {
                tempLen += 2;
            }
            else
            {
                tempLen += 1;
}


try
            {
                tempString += inputString.Substring(i, 1);
            }
            catch
            {
                break;
}


if (tempLen > len)
                break;
        }
        //如果截过则加上半个省略号
        byte[] mybyte = System.Text.Encoding.Default.GetBytes(inputString);
        if (mybyte.Length > len)
            tempString += "…";


return tempString;
    }

string get字符串="01-蓝";
string get后 = get字符串.Substring(0, get字符串.IndexOf("-"));
这样获取的数据是:蓝

string get后 = get字符串.Substring(get字符串.IndexOf("-"),get字符串.Length - get字符串.IndexOf("-"));