转载：https://www.cnblogs.com/jinaczg/p/9001771.html
//1、用字符串分隔：
string s = "";
string str = "aaajsbbbjsccc";
string[] sArray = Regex.Split(str, "js", RegexOptions.IgnoreCase);
foreach (string i in sArray)
s += i + "\r";
MessageBox.Show(s);
//2、用多个字符来分隔：
s = "";
string str2 = "aaajbbbscccjdddseee";
string[] sArray2 = str2.Split(new char[2] { 'j', 's' });
foreach (string i in sArray2)
s += i + "\r";
MessageBox.Show(s);
//3、用单个字符来分隔：
s = "";
string str3 = "aaajbbbjccc";
string[] sArray3 = str3.Split('j');
foreach (string i in sArray)
s += i + "\r";
MessageBox.Show(s);
