string s1 ="打";
string s2 = "打击";
if (s1 == s2)
 Console.WriteLine("字符串相等");
else
 Console.WriteLine("字符串不相等");

------解决方案--------------------
string ss0 = "打";
string ss1 = "打击";
if(ss0.CompareTo(ss1) == 0)
 Console.WriteLine("字符串匹配");
else
 Console.WriteLine("字符串不匹配");


------解决方案--------------------
^打[\u4e00-\u9fa5]?$

------解决方案--------------------
用string类的静态方法compare，看看行不行

------解决方案--------------------
string s1 ="打";
string s2 = "打击";
if (ss0.Equles(ss1))
  Console.WriteLine("字符串相等");
else
  Console.WriteLine("字符串不相等");