C# 字符串分割

Question

string s = "dsafdfgasd||455565";            string reg = "||";             string[] str = Regex.Split(s, reg, RegexOptions.IgnoreCase);            foreach (string i in str)                Response.Write(i.ToString());为什么这样的结果相当于没有分割。而string s = "dsafdfgasd||455565";            string reg = "ga";             string[] str = Regex.Split(s, reg, RegexOptions.IgnoreCase);            foreach (string i in str)                Response.Write(i.ToString());可以分割成两个字符串呢，求正解！小弟感激不尽

Answer 1

因为||是两个特殊符号组成的。单个的｜在正则表达式中表示或的关系，如（a|b)表示a或b