Question

I want to check the input from the user to make sure that they only enter dots and dashes and any other letters or numbers will give back and error message. Also i wanted to allow the user to enter a space yet when i am converting how can i remove or ignore the white space?

string permutations;
        string entered = "";
        do
        {
            Console.WriteLine("Enter Morse Code: \n");
            permutations = Console.ReadLine();
         .
         .
         } while(entered.Length != 0);

Thanks!

Answer 1

string permutations = string.Empty;
Console.WriteLine("Enter Morse Code: \n");
permutations = Console.ReadLine(); // read the console
bool isValid = Regex.IsMatch(permutations, @"^[-. ]+$"); // true if it only contains whitespaces, dots or dashes
if (isValid) //if input is proper
{
    permutations = permutations.Replace(" ",""); //remove whitespace from string
}
else //input is not proper
{
    Console.WriteLine("Error: Only dot, dashes and spaces are allowed. \n"); //display error
}