Question

I was looking at a C# Regex tutorial which stated that “\d” matches a single digit 0 to 9.

However when I ran the following program.

    static void Main(string[] args)
    {
        string s = "45";
        Regex myRegex = new Regex(@"(\d)");

        if( myRegex.IsMatch(s))
        {
            System.Console.WriteLine("Matched");
        }
        else
        {
            System.Console.WriteLine("Not Matched");
        }

        Console.ReadKey();
    }

The console printed out “Matched”.

Answer 1

Regex myRegex = new Regex(@"^\d$");