using System;

using System.Text.RegularExpressions;

​

public class Program

{

    public static void Main()

    {

        // The original string to search within.

        string s = "Mobile2: 040534343";

        // Define a regular expression for executing the search.

        Regex rgx = new Regex(@"(\+?\d*)", RegexOptions.IgnoreCase);

        // Find matches.

        MatchCollection matches = rgx.Matches(s);

        int t=0;

        foreach (var match in matches) {

            Console.WriteLine("Match number " + t + ": '" + match + "'" );

            t++;

        }

    }

}