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("-"));