How to find the Index of Substring in C# - Step by Step Examples

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How to find the Index of Substring in C# ?

Answer

To find the index of a substring in C#, you can use the IndexOf method of the String class.

✐ Examples

1 Find Index of Substring in String

In this example,

We create a string variable named str with a string value.
We use the IndexOf method of str to find the index of a specific substring within str.
The IndexOf method returns the starting index of the substring in the string.
Finally, we display the index.

C# Program

using System;
class MainClass {
  public static void Main (string[] args) {
    string str = "Hello World";
    int index = str.IndexOf("World");
    Console.WriteLine("Index of substring is: " + index);
  }
}

Output

Index of substring is: 6

2 Find Index of Substring in Another String

In this example,

We create two string variables named str1 and str2 with different values.
We use the IndexOf method of str1 to find the index of str2 within str1.
The IndexOf method returns the starting index of str2 in str1.
Finally, we display the index.

C# Program

using System;
class MainClass {
  public static void Main (string[] args) {
    string str1 = "apple banana cherry banana";
    string str2 = "cherry";
    int index = str1.IndexOf(str2);
    Console.WriteLine("Index of substring is: " + index);
  }
}

Output

Index of substring is: 13

Summary

In this tutorial, we learned How to find the Index of Substring in C# language with well detailed examples.

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How to find the Index of Substring in C# - Step by Step Examples

How to find the Index of Substring in C# ?

Answer

✐ Examples

1 Find Index of Substring in String

C# Program

Output

2 Find Index of Substring in Another String

C# Program

Output

Summary

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