How to remove characters from a string, except those in a list

Question

This is my string value:

string str = \"32 ab d32\";

And this list is my allowed characters:

var allowedCharacters = new List&l         


        

Answer 1

Without regex:

IEnumerable allowed = srVariable
    .Select(c => lstAllowedCharacters.Contains(c.ToString()) ? c : ' ');
string result = new string(allowed.ToArray());