C# find substring code example

Example 1: c sharp index of substring

// To find the index of the first substring in a string use
// 'IndexOf()'
string str = "Hello World!"
str.IndexOf("o"); // Output: 4

// You can give a starting index and a length to search at
str.IndexOf("o", 6, 4); // Output: 7

// To find the last instance of a substring use 'LastIndexOf()'
str.LastIndexOf("o"); // Output: 7

Example 2: how to look for substring in string in c#

String phrase = "this is the ultimate string";

Console.WriteLine(phrase.Contains("this")); //returns True
Console.WriteLine(phrase.Contains("python")); //returns False

Example 3: c# substring find word

public static string GetSubstring(string l_Source, string l_FindCharacter)
  {
    if (!l_Source.Contains(l_FindCharacter)) return string.Empty;
    int End = l_Source.IndexOf(l_FindCharacter, 0) + l_FindCharacter.Length;
    return l_Source.Substring(0, End - 1);
  }
//string l_Data = GetSubstring("100000.00", "."); //Test //100000

Example 4: c# find substring in string

string fullName = "John Doe";
bool nameInFullName = fullName.Contains("John");
// nameInFullName is true