This little code snip, translates a Dynamics NAV regular expression into its  .Net equivalent.

public static string NavisionRegToRegex(string strtotest)
        {
            string navregex = strtotest;

            navregex = "(" + navregex + ")$"; // make sure we are testing to the end of the string
            navregex = navregex.Replace("*", ".*"); // 0 or more
            navregex = navregex.Replace("?", ".{1}"); // single char
            // or operator is a |
            navregex = navregex.Replace("&", "");
            return navregex;
        }