CODEWITHSUNDEEP
c#string
Nano HE
Nano HE

Reputation: 9307

How to get the last five characters of a string using Substring() in C#?

I can get the first three characters with the function below.

However, how can I get the output of the last five characters ("Three") with the Substring() function? Or will another string function have to be used?

static void Main()
{
    string input = "OneTwoThree";

    // Get first three characters
    string sub = input.Substring(0, 3);
    Console.WriteLine("Substring: {0}", sub); // Output One. 
}

Upvotes: 57

Views: 239160

Answers (12)

methos
methos

Reputation: 111

In C# 8.0 and later you can use [^5..] to get the last five characters combined with a ? operator to avoid a potential ArgumentOutOfRangeException.

string input1 = "0123456789";
string input2 = "0123";
Console.WriteLine(input1.Length >= 5 ? input1[^5..] : input1); //returns 56789
Console.WriteLine(input2.Length >= 5 ? input2[^5..] : input2); //returns 0123

index-from-end-operator and range-operator

Upvotes: 0

Payson Welch
Payson Welch

Reputation: 1428

Here is a quick extension method you can use that mimics PHP syntax. Include AssemblyName.Extensions to the code file you are using the extension in.

Then you could call:

input.SubstringReverse(-5) and it will return "Three".

namespace AssemblyName.Extensions {

    public static class StringExtensions
    {
        /// <summary>
        /// Takes a negative integer - counts back from the end of the string.
        /// </summary>
        /// <param name="str"></param>
        /// <param name="length"></param>
        public static string SubstringReverse(this string str, int length)
        {
            if (length > 0) 
            {
                throw new ArgumentOutOfRangeException("Length must be less than zero.");
            }

            if (str.Length < Math.Abs(length))
            {
                throw new ArgumentOutOfRangeException("Length cannot be greater than the length of the string.");
            }

            return str.Substring((str.Length + length), Math.Abs(length));
        }
    }
}

Upvotes: 2

David Cahaya
David Cahaya

Reputation: 1

// Get first three characters
string sub = input.Substring(0, 3);
Console.WriteLine("Substring: {0}", sub); // Output One. 

string sub = input.Substring(6, 5);
Console.WriteLine("Substring: {0}", sub); //You'll get output: Three

Upvotes: -2

craiglimpo
craiglimpo

Reputation: 11

e.g.

string str = null;
string retString = null;
str = "This is substring test";
retString = str.Substring(8, 9);

This return "substring"

C# substring sample source

Upvotes: 0

Mehdi
Mehdi

Reputation: 147

static void Main()
    {
        string input = "OneTwoThree";

            //Get last 5 characters
        string sub = input.Substring(6);
        Console.WriteLine("Substring: {0}", sub); // Output Three. 
    }

  • Substring(0, 3) - Returns substring of first 3 chars. //One

  • Substring(3, 3) - Returns substring of second 3 chars. //Two

  • Substring(6) - Returns substring of all chars after first 6. //Three

Upvotes: 10

anandd360
anandd360

Reputation: 306

Substring. This method extracts strings. It requires the location of the substring (a start index, a length). It then returns a new string with the characters in that range.

See a small example : 

string input = "OneTwoThree";
// Get first three characters.
string sub = input.Substring(0, 3);
Console.WriteLine("Substring: {0}", sub);

Output : Substring: One

Upvotes: 1

hrk1991
hrk1991

Reputation: 3

string input = "OneTwoThree";
(if input.length >5)
{
string str=input.substring(input.length-5,5);
}

Upvotes: 0

WiiMaxx
WiiMaxx

Reputation: 5420

simple way to do this in one line of code would be this

string sub = input.Substring(input.Length > 5 ? input.Length - 5 : 0);

and here some informations about Operator ? :

Upvotes: 0

Mark Byers
Mark Byers

Reputation: 838736

If your input string could be less than five characters long then you should be aware that string.Substring will throw an ArgumentOutOfRangeException if the startIndex argument is negative.

To solve this potential problem you can use the following code:

string sub = input.Substring(Math.Max(0, input.Length - 5));

Or more explicitly:

public static string Right(string input, int length)
{
    if (length >= input.Length)
    {
        return input;
    }
    else
    {
        return input.Substring(input.Length - length);
    }
}

Upvotes: 78

PMN
PMN

Reputation: 1731

If you can use extension methods, this will do it in a safe way regardless of string length:

public static string Right(this string text, int maxLength)
{
    if (string.IsNullOrEmpty(text) || maxLength <= 0)
    {
        return string.Empty;
    }

    if (maxLength < text.Length)
    {
        return text.Substring(text.Length - maxLength);
    }

    return text;
}

And to use it:

string sub = input.Right(5);

Upvotes: 10

Blair Holloway
Blair Holloway

Reputation: 16509

One way is to use the Length property of the string as part of the input to Substring:

string sub = input.Substring(input.Length - 5); // Retrieves the last 5 characters of input

Upvotes: 2

kennytm
kennytm

Reputation: 523514

string sub = input.Substring(input.Length - 5);

Upvotes: 14

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