Tutorial :String Formatting: remove the last underscore and the following characters

Question:

I have a list of strings like

 A_1   A_2   A_B_1   X_a_Z_14

i need to remove the last underscore and the following characters.

so the resulting list will be like

A  A  A_B  X_a_Z

Solution:1

var data = new List<string> {"A_1", "A_2", "A_B_1", "X_a_Z_14"};    int trimPosition;  for (var i = 0; i < data.Count; i++)           if ((trimPosition = data[i].LastIndexOf('_')) > -1)              data[i] = data[i].Substring(0, trimPosition);

Solution:2

string[] names = {"A_1","A_2","A_B_1","X_a_Z_14" };  for (int i = 0; i < names.Length;i++ )     names[i]= names[i].Substring(0, names[i].LastIndexOf('_'));

Solution:3

var s = "X_a_Z_14";  var result = s.Substring(0, s.LastIndexOf('_') ); // X_a_Z

Solution:4

string s = "X_a_Z_14";    s = s.Substring(0, s.LastIndexOf("_"));

Solution:5

input.Substring(0,input.LastIndexOf("_"));

Solution:6

There is also the possibility to use regular expressions if you are so-inclined.

  Regex regex = new Regex("_[^_]*$");  string[] strings = new string[] {"A_1", "A_2", "A_B_1", "X_a_Z_14"};  foreach (string s in strings)  {      Console.WriteLine(regex.Replace(s, ""));  }

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