Question

How to extract the number from the end of a string in C#

Answer 1

using System;

public class ExtractTheNumberFromEndOfString_CSharp
{
    public static int ExtractLastNumber(string str) {
        string[] arr = System.Text.RegularExpressions.Regex.Split(str, @"\D+");
        
        return int.Parse(arr[arr.Length - 1]);
    }

    public static void Main(string[] args)
    {
        string str = "C# 72 Programming9036";
        
        int n = ExtractLastNumber(str);
        
        Console.Write(n);
    }
}

  
/*
run:
  
9036
  
*/

 

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Answer 2

using System;

public class ExtractTheNumberFromEndOfString_CSharp
{
	public static int extractLastNumber(string str) {
		int i = str.Length;

		while (i > 0 && char.IsDigit(str[i - 1])) {
				i--;
		}

		return int.Parse(str.Substring(i));
	}

	public static void Main(string[] args)
	{
		string str = "c# 84 programming172";

		int n = extractLastNumber(str);

		Console.Write(n);
	}
}


  
/*
run:
  
172
  
*/

 

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