简单字符串处理

string str1 = "ABCDEFGHIJK";
string str2 = "小嘛小二郎";
//根据单个分隔字符用split截取
string[] sArray = str2.Split('二');
sArray[0] = "小嘛小";
sArray[1] = "郎";
//提取字符串中的第i个字符开始的长度为j的字符串；
//从2开始截取到8停止故值为CDEFGHIJ
string a1 = str1.Substring(2, 8);
//==str1.Substring(str1.Length - 5,str1.Length)GHIJK
string a2 = str1.Substring(str1.Length - 5);
//替换字符串中的特定字符串
//321DEFGHIJK
string a3 = str1.Replace("ABC", "321");