Substring index

IndexOf method from string type tells us the index of a substring.


using System;

class Sample
{
    public static void Main()
    {
        string s = "java2s.com";

        Console.WriteLine(s.IndexOf("com"));
    }
}

The output:

IndexOf returns -1 if not found.


using System;

class Sample
{
    public static void Main()
    {
        string s = "java2s.com";

        Console.WriteLine(s.IndexOf("C#"));
    }
}

The output:

-1

We can perform the search from a starting point.


using System;

class Sample
{
    public static void Main()
    {
        string s = "java2s.com";

        Console.WriteLine(s.IndexOf("a", 2));
    }
}

To seach in a case-insensitive manner, use the StringComparison enum.


using System;

class Sample
{
    public static void Main()
    {
        Console.WriteLine("abcde".IndexOf("CD", 
            StringComparison.CurrentCultureIgnoreCase));  // 2

    }
}

The output:

LastIndexOf works the same way as IndexOf, but is searches from the end of the string.


using System;

class Sample
{
    public static void Main()
    {
        string s = "java2s.com";

        Console.WriteLine(s.LastIndexOf("a"));
    }
}

The output:

« string search: contains, start with, end with

Index of any characters. »

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