C# Program to Match All the Digits in a String

To match all digits in a string, use C# Regex.

Firstly, set a string with digits −

string str = "These are my marks: 90 out of 100!";

Use the following regular expression to get digits in a string −

@"\d+"

The following is the code −

Example

 Live Demo

using System;
using System.Text.RegularExpressions;
namespace Demo {
   class Program {
      private static void showMatch(string text, string expr) {
         Console.WriteLine("The Expression: " + expr);
         MatchCollection mc = Regex.Matches(text, expr);
         foreach (Match m in mc) {
            Console.WriteLine(m);
         }
      }
      static void Main(string[] args) {
         string str = "These are my marks: 90 out of 100!";
         Console.WriteLine("Getting digits from a string...");
         showMatch(str, @"\d+");
         Console.ReadKey();
      }
   }
}

Output

Getting digits from a string...
The Expression: \d+
90
100